After 10 hours of gameplay, I've met my wall. Entity Shade(I've spent 4 days grinding and trying again but he DESTROYS me). It seems that I don't have any Pokemon able to outspeed his really fast Pokemon—Gengar, Rotom, Bannette and Chandelure(?). But really, it's the Rotom and Gengar that keeps KO-ing my team. I can't get a good start without Gengar hitting my Mightyena first and completely destroying my chances of even reaching Rotom. However, when I did manage to get around his Pokemon, Rotom just obliterated me and I can't do anything about his health because LEFTOVERS.
Here's my current team:
Mightyena(The lead)
Quiet Nature
Moxie Ability
-Assurance
-Crunch(Many common candies were used to bring down his level after obtaining this move)
-Bite
-Roar
Growlithe(Hopeful follow up but since I can't evolve him to Arcanine without the fire stone, he's going to get out-sped.)
Naughty Nature
Flash Fire Ability
-Crunch
-Retaliate
-Flamethrower
-Flame burst
Greninja
Hasty Nature
Protean ability
-Water Pulse
-Feint Attack
-Shadow Sneak
-Round
Luxray
Hasty Nature
Guts ability
-Thunder Fang
-Roar
-Spark
-Bite
Zebstrika(Field Changer)
Lax Nature
Lightning Rod Ability
-Flame Charge
-Stomp
-Discharge
-Thunder Wave
Other Pokemon to take note of that are in rotation:
Nidoking
Impish Nature
Sheer Force Ability
-Horn Attack
-Double Kick
-Thrash
-Toxic Spikes (Was thinking of using him for a set-up)
Ampharos
Bold Nature
Static Ability
-Thunder Wave
-Thunder Punch
-Power Gem
-Confuse Ray
Onix(Um I'm not sure if he's even suitable for this gym, so I haven't levelled him up yet)
Timid Nature
Weak Armour Ability
Buizel(Maybe, as of how he's Lvl 25)
Gentle Nature
Swift Swim Ability
-Pursuit
-Swift
-Aqua Jet
-Furry Cutter
