If you could make your own ability...

[NickCrash]

Steampunk: Powers up Steel type moves by x1.5 when at 33% HP or less.

Gambler: Doubles recoil damage from moves used by or against this pokemon.

Veteran: Forces opponent out when hit by a Super Effective attack.

[Ironbound]

Anything relating to boosting Steel types wins my approval.

Razor's Edge: Slashing moves are boosted in power by 20%. (Slash, Razor Wind, Air Cutter, Air Slash, Night Slash, Shadow Claw, Leaf Blade, Psycho Cut, Razor Shell, X-Scissor, Aerial Ace, Cross Poison, Dragon Claw, Sacred Sword, Secret Sword, and anything else of a similar kind that I have missed.

Even Cut)

[Deleted User]

Combustion: Pokemon heals 1/8th HP from being burned at the end of each turn.

(Note: Attack Reduction still occurs, so it's best used on things more special based)

Some pokemon I could see getting this ability:

Voltorb/Electrode

Forretress

Solrock

Bronzor/Bronzong

Magnezone

Probopass

Klink/Klang/Klinklang

[Phi-Bi]

I wonder about that too, and speaking of glitch what about this annoying ability?

Error: May cause the foe's move against the pokemon get cancelled if the pokemon move after the foe. (Basically a reverse flinch where faster pokemon can flinch, the chance is about 30% or less)

And some ghostly abilities cause its over midnight here:

Afterlife: May faint the foe landing the finishing hit. (Basicaly a fusion between aftermath, cursed body, and destiny bond)

Spectre: Contact with the pokemon may curse the attacker. (Poison Point variation for curse)

Soul Eater: Ghost moves absorb the foe's HP by 33%.

Also inspired by PULSE Avalugg, an ability that boost Ice type defensively:

Hard Ice: Nullifies ice type weakness. (Fighting, Fire, Rock, and Steel moves deal 50% damage to ice type only works for ice type pokemon).

Edited April 11, 2016 by PhantomBima

[Ironbound]

Moar steeeel!

Crushing Weight: Weight-based moves always deal maximum damage, regardless of normal calculations.

(Spam Heavy Slam! Also works for moves like Low Kick which depend on the opponent's weight)

Exploitation: Super Effective moves deal 20% more damage. (An ability version of Expert Belt)

Fragmentation: Shard and Projectile moves deal 30% more damage.

(Ice Shard, Icicle Crash, Pin Missile, Twineedle, Rock Blast, Bullet Seed, and things like that)

[Hank_Nghiem]

Ace Pokemon - If a pokemon with this ability enters battle with another pokemon above its evolutionary stage or legendary it gains a boost to all its stats.

Got this idea thinking of my little sister who enjoys battling but with only baby stage Pokémon like Squirtle. Thinking, with this ability those Pokémon can see usage in battle against those fully evolved Pokémon. Probably a scaling ration of .5 against second stage, and 1 against legendary and fully evolved. Maybe we can see those cute Pokémon rising into usage?

[firewidow]

My own ability huh... Sleepfighting (instead of sleep walking) Boost the users move's dmg if the user is asleep

[laggless01]

Gambler is a bit too much like Reckless, only without power boost...

Wide Impact - Any move above 80 BP destroys the field. (or from 80 BP perhaps...argument of Oblivion Wing vs X-Scissor)

Data Overload - Gets hit super effectively by Electric-type attacks, but doubles the power of its own. (intended for an Electric type, but Porygon-line could work, too)

Energy storage - Getting hit by an Electric-type attack boosts the power of your next attack by 1,5x (Lightning rod gives a stat boost, this doesn't. Physical moves can get powered up as a trade-off.)

Judoka (for Throh perhaps) - Physical moves have a chance to be countered with no damage taken.

Thousand Fists - Punching moves can be used without PP.

Heavy Blizzard - Legendary version of hail (these additions to the original weather): halves speed of non-Ice types (possibly also slight Accuracy deduction?), Fire-moves are quartered in power, Water-moves fail if the user isn't Ice-type (because frozen water). Well-fit for Articuno.

(Instant) Karma - Getting afflicted by a status condition makes its next move's secondary effect certain. (Imagine Ice Beam or Ancientpower after getting paralyzed)

[Fumble]

Unleashed power:all not very effective/not effective moves hit for super effective damage

Seems a bit too stronk since this is a more OP version of Tinted Lens, which is already a great Ability, unless you give it to stuff like Unown (Hidden Power - Unleashed Power)

[laggless01]

Planner - Two-turn attacks increase in power. (like x1,5. inpredictability traded off for more power)
Coward - Retreats if taking more than 50% damage (of its original HP stat). (In the wild, flees when done so.)
Conductor - Electric-moves gain +1 Priority

[Kagamine]

Tantrum/Temper

Increases the power of all rage/anger related moves by 1.5x

Affected moves: rage, outrage, uproar, thrash, dragon rage (does 60 damage every time), explosion, frustration, punishment, snarl, fury swipes, fury attack, hyperspace fury

Persuasion

All stat raising or stat lowering status moves have their affects doubled

(I.E, cotton guard would raise defense all the way up, swords dance raises attack 4 stages, swagger raises opponents attack 4 stages, leaf storm lowers special attack four stages)

Nurse

All healing moves heal 1.5x more

[doombotmecha]

persuasion is a clone of simple. Could be a rename for classier mons who wouldn't be caught dead with simple

Communism: Whenever a stat s boosted, every active pokemon receives the boost

basically something to mess with setup sweepers/doubles, especially if the pokemon with the ability has curse or another boosting move that can harm other mons, or if facing an enemy with Download

[Bessi]

Decoy:the user cant be fainted by super effective moves

Frozen Body:freezes the attacker on contact

Strong Will:damage taken when having a status condition is halved

[NickCrash]

Gambler is a bit too much like Reckless, only without power boost...

The two have nothing in common. Gambler is a defensive ability while Reckless is an offensive one.

[laggless01]

The two have nothing in common. Gambler is a defensive ability while Reckless is an offensive one.

Well, it's a bit of a mix. Gambler would also affect the opponent, true, but Reckless too gives the holder more recoil, but a power boost in return. It's the latter that made it feel familiar to me.

Daring - if the only mon in your party, its stats get a boost. (Not when you have five fainted ones, it has to be the ONLY mon you have.)

Edit (2 may 2016): some other abilities:

Crystallize - Ice-version of Flash Fire.

Final Charge - When HP in red, next attack is boosted to 150%, but makes the user faint.

Edited May 2, 2016 by laggless01

[laggless01]

Some new ones I came up with:

Duelist - Secondary effects involving the mon do not take place (so poison jab on it nor by it have a chance to poison e.g.)

Time break - removes any sort of priority from moves when on the field. (so no -1 for counter, nor +whatever for protect. Imagine all the fun.)

Mortal Draw - if HP low (maybe red, maybe <10%) and not behind a substitute, attacking moves by and on the mon drastically increase in power (x5)

Socialism - items only work if all mons on the field have the same item.

[Ironbound]

Ah, good to rediscover this. I have some more ideas:

Dissipate: Grants immunity to Focus and Charge moves.

This is a cool variant of Bulletproof, I think. It works on the concept of scattering a concentrated attack, so moves like Focus Blast, Charge Beam, Discharge, Mirror Shot, Focus Punch, Solarbeam and some others will fail. Lock On will also fail.

[Jmanultrax1]

Spirit heart: sort of like all starter abilities. Except different.

When the user's health is below 1/3 of its maximum health its att and sp.att will be increased by x1.5.

Inflame: normal type moves now become fire type attacks

[laggless01]

Inflame: normal type moves now become fire type attacks

Pitbull: fire-version of Normalize ('cause baby I'm a fireball)

(yh, it's a really bad one )

Dissipate: Grants immunity to Focus and Charge moves.

This is a cool variant of Bulletproof, I think. It works on the concept of scattering a concentrated attack, so moves like Focus Blast, Charge Beam, Discharge, Mirror Shot, Focus Punch, Solarbeam and some others will fail. Lock On will also fail.

Maybe make Charge fail, too.

[Ironbound]

I would have included Charge, but it's not an attack, just a set-up move. To cancel that as well would be to make Dissipate an area-ability, rather like Damp. That doesn't make sense to me, in all honesty. It's not as if Bulletproof prevents the use of ball and bomb moves, anyhow; it merely renders the possessor immune. So Charge, which doesn't target the possessor, will work. Likewise, in a multi battle, Focus and Charge moves will connect if a different Pokemon is targeted.

[Raindrop Valkyrie]

still one I like from a scrapped mon concept I never got far with.

Shrapnel Shell: When the user takes damage from a physical contact move, a layer of Spikes is laid on the enemy side of the field. It lowers the user's Defense by one.

Similar in concept would be...

Rubbish Shell: When the user takes damage from a physical contact move, a layer of Toxic Spikes is laid on the enemy side of the field. It lowers the user's Defense by one.

[NickCrash]

Why physical? I understand the effect is triggered by contact, so why not allow special as well?

[Raindrop Valkyrie]

I just meant contact... I suppose that's only referred to as contact in mons though since... there's some special moves that do. ((Like Grass Knot.)) that's what I mean though XD> Just contact moves.

Also I'm sure a few of these have been made already but... screw I'mma give them my own names.

Fluctuate: Turns a Normal Type move into water type

Ebonize((or Umbranate)): Turns a normal type move into Dark Type.

Galvanize: Makes Normal type moves, turn into Electric type.

Pollinate: Makes Normal type moves, turn into Grass type.

[laggless01]

All Out - Boosts recharge moves by 50%

Knuckle-duster - Deals additional Steel-type damage when using an attack with its hands (Counter(!), punches, slashes etc.)

Mirror Scale - Turns back light-based moves without taking damage (Dazzling Gleam, Solarbeam, Flash, (Moonblast?,) Mirror Shot, Flash Cannon...)

[Ironbound]

I was gonna suggest 'Refract' which merely grants immunity to Light-based moves, working on the same concept as Dissipate and Bulletproof. Then you give Mirror Scale, which is borked :]

Anyways:

Temporal Shift: For Primal Dialga. Creates 5 turns of Trick Room 'weather' in which Charge and Recharge moves are fired immediately without consequence (spam Roar of Time!)