DELTA BLAZTOISE
I don’t really like him, I feel like there is so much better mega than him, but he isn’t really viable without. So, I think he is best suited as a Bulky Wallbreaker.
Mega Delta Blastoise
(Ideally) Modest Nature
EVs: 252 Hp / 252 SpA / 4 Spe
IVs: 0 Atk (don’t matter that much) / 31 everywhere else.
-Nasty Plot
-Dark Pulse
-Aura Shpere
-Vaccum Wave.
GRENINJA
Protean is a blessing. Keep in mind he is frail, so don’t switch in directly into attack other than psychic type.
Geninja
Ability Protean
Item: Life Orb
EVs: 4 Def / 252 SpA / 252 Spe
IVs: 0 Atk (doesn’t matter that much) / 31 everywhere else
Timid Nature
-Ice Beam
-Scald / Hydro Pump
-Dark Pulse
-U-Turn / Extrasensory
DELTA HAXORUS
I’m not a Delta Pokémon specialist, but I have a little knowledge about him. I like a lot using him as a Priority user.
Delta Haxorus
Ability: Water Veil / Strong Jaws
Item: Choice Band
EVs: 252 Atk / 4 Def / 252 Spe
IVs: 31 Everywhere except SpA where it doesn’t matter
(Ideally) Jolly Nature
-Aqua Jet / Bullet Punch
-Iron Head
-Waterfall
-Crunch
Aqua Jet was the best idea, but since he learn it only as its pre-evolution, you waised it. Bullet Punch is fine.