oho
OHO
LET'S FUCKING GO
I've made enough custom megas so far to make this post insanely long, but for now just take these two.
Mega Watchog
Type: Normal/Psychic Ability: Compound Eyes
HP: 60
Attack: 85 -> 132 (+47)
Defense: 69
Special Attack: 60
Special Defense: 69
Speed: 77 -> 130 (+53)
'Bibs did you really just only boost it in Attack and Speed.'
Why yes, yes I did. 130 Speed makes it nearly as fast as Mega Lopunny and Mega Manectric, of which we all know they are lightning-fast. 132 Attack also makes for a stat nearly as high as Mega Lopunny's. So is this Watchog just a cheap rip-off from what Mega Lopunny can? And why part Psychic, in a metagame where everything carries Knock Off and Sucker Punch?
First let's take a look at the ability. Compound Eyes is a move mostly used for Bug-type Pokémon, but look at its eyes and tell me that Watchog can't have Compound Eyes. The chances of Iron Tail hitting are a lot higher now (I can't be bothered to calculate it), and Gunk Shot, Aqua Tail and STAB Zen Headbutt will always hit. But that's not really the main reason for the ability. The main reason is Hypnosis, which now has 78% accuracy, making Mega Watchog one of the fastest sleep inducers of all Pokémon. It's still not 100% reliable, but hey. It's still better than Sleep Powder. Also, thanks to Hypnosis, Mega Watchog can troll the Sucker Punch users, while not being weak to Mach Punch anymore.
Of course Watchog isn't made to be top-tier or something. I mean, it's Watchog. There's only so much you can do for this thing. Its bulk is still so low that it would probably die quickly to any attack as soon as its opponent wakes up. But hey, we tried.
And on that note.
Mega Lumineon
Type: Water/Flying
Ability: Serene Grace
HP: 69
Attack: 69 -> 94 (+25)
Defense: 76 -> 86 (+10)
Special Attack: 69 -> 94 (+25)
Special Defense: 86 -> 106 (+20)
Speed: 91 -> 111 (+20)
One of my custom megas I am the fondest of. This Mega Lumineon is built to troll. And I literally mean troll, as in Scald now has a 60% chance to burn your opponent. Not only that, but Lumineon has quite the movepool to abuse Serene Grace. Psybeam and Signal Beam with 20% chance to confuse. Silver Wind and Ominous Wind can boost all your stats, and have a chance of 20% of doing so. Ice Beam has 20% chance to freeze. Last but not least, Nature Power turns into Tri Attack in competitive, and has a chance of 40% of freezing, burning or paralyzing your opponent. But except for Scald and Ice Beam, none of these moves really excel.
That's why Mega Lumineon also received Attack investment, as well as the new Flying-type. Yes, Flying is not only to negate the Grass weakness. You see, Mega Lumineon also has a funny physical movepool as well. First off, of course Waterfall. Waterfall has solid power, plus now a 40% chance to make your opponent flinch. Next up, Bounce. Bounce now gets STAB, plus it has a 30% chance to paralyze...before Serene Grace. So actually 60%. And last but not least, Lumineon can use U-turn as well, to get out of the battle if it becomes too dangerous for it.
Mega Lumineon's stats still aren't the best. It would be a lot better if only it got a move like Roost, but sadly, Gamefreak didn't permit that. Its attacking stats aren't stellar, and neither is its bulk. However, it is able to troll quite a few Pokémon. Most notable checks to poor Lumineon are Electric-types. If you use Bounce and your opponent switches into a slow Electric-type Pokémon, you're in a world of pain.
Long story short. Mega Lumineon isn't top-tier either, but it can work.