Partner ideas
for Greninja (mega)
Pairing ideas, not prescriptions — ideas to test, with every reason traceable. Each card sums up what the partner does for Mega Greninja: completing its plan, patching weaknesses, breaking walls — and how often the two already team up in ranked play. Downsides sit under the card, never hidden. Open a card’s Partnership Report for every reason.
Often paired (4)

Gholdengo
SteelGhostOn 10% of Mega Greninja's ranked teams
Resists GrassImmune to FightingResists BugResists FairyImmune to Mega Greninja's Sludge WaveHits Bug super-effectively with Power Gem
Sneasler
FightingPoisonOn 17% of Mega Greninja's ranked teams
Resists GrassResists FightingResists BugResists Mega Greninja's Sludge WaveHits Grass super-effectively with Dire ClawHits Fairy super-effectively with Dire Claw
Pelipper
WaterFlyingOn 15% of Mega Greninja's ranked teams
Resists FightingResists BugResists Mega Greninja's SurfHits Grass super-effectively with HurricaneHits Fighting super-effectively with HurricaneHits Bug super-effectively with Hurricane
Archaludon
SteelDragonOn 15% of Mega Greninja's ranked teams
Resists GrassResists ElectricResists BugImmune to Mega Greninja's Sludge WaveResists Mega Greninja's SurfHits Fairy super-effectively with Flash Cannon
Spicy Tech (1)

Gourgeistjumbo variety
GhostGrassFighting immunity via Trick-or-Treat
Resists GrassResists ElectricImmune to FightingResists Mega Greninja's SurfAdds long-game durabilityalso: Gourgeist (Small Variety), Gourgeist, Gourgeist (Large Variety)
Defensive glue (19)

Mawile
SteelFairyCovers its Grass, Bug and Fairy weaknesses
Immune to Mega Greninja's Sludge WaveMega Greninja resists its Brutal SwingHits Grass super-effectively with Fire BlastHits Fighting super-effectively with Play RoughHits Bug super-effectively with Fire BlastHits Fairy super-effectively with Steel Beam
Skeledirge
FireGhostCovers its Grass, Fighting, Bug and Fairy weaknesses
Resists Mega Greninja's Sludge WaveHits Grass super-effectively with Heat WaveHits Electric super-effectively with Earth PowerHits Fighting super-effectively with Alluring VoiceHits Bug super-effectively with Heat WaveAdds long-game durability
Stunfiskgalarian
GroundSteelCovers its Electric, Bug and Fairy weaknesses
Immune to Mega Greninja's Sludge WaveMega Greninja resists its SurfHits Grass super-effectively with Sludge WaveHits Electric super-effectively with EarthquakeHits Bug super-effectively with Stone EdgeHits Fairy super-effectively with Steel Beam
Beedrill
BugPoisonCovers its Grass, Fighting, Bug and Fairy weaknesses
Resists Mega Greninja's Sludge WaveMega Greninja resists its Brutal SwingHits Grass super-effectively with Bug BuzzHits Electric super-effectively with Drill RunHits Fairy super-effectively with Sludge Bomb
Toxicroak
PoisonFightingCovers its Grass, Fighting and Bug weaknesses
Resists Mega Greninja's Sludge WaveMega Greninja's Surf can heal Toxicroak via Dry SkinHits Grass super-effectively with Gunk ShotHits Fairy super-effectively with Gunk ShotAdds team-wide guard support
Ceruledge
FireGhostCovers its Grass, Fighting, Bug and Fairy weaknesses
Resists Mega Greninja's Sludge WaveHits Grass super-effectively with Bitter BladeHits Bug super-effectively with Bitter BladeAdds team-wide guard supportAdds long-game durability
Goodrahisuian
SteelDragonCovers its Grass, Electric and Bug weaknesses
Immune to Mega Greninja's Sludge WaveResists Mega Greninja's SurfHits Grass super-effectively with Ice BeamHits Fairy super-effectively with Flash CannonAdds long-game durability
Forretress
BugSteelCovers its Grass, Bug and Fairy weaknesses
Immune to Mega Greninja's Sludge WaveHits Grass super-effectively with Bug BuzzHits Electric super-effectively with EarthquakeHits Bug super-effectively with Stone EdgeHits Fairy super-effectively with Steel BeamAdds long-game durability
Dragalge
PoisonDragonCovers its Grass, Electric, Fighting and Bug weaknesses
Resists Mega Greninja's Sludge WaveResists Mega Greninja's SurfHits Grass super-effectively with Sludge WaveHits Fairy super-effectively with Sludge Wave
Dragapult
DragonGhostCovers its Grass, Electric, Fighting and Bug weaknesses
Resists Mega Greninja's Sludge WaveResists Mega Greninja's SurfHits Grass super-effectively with FlamethrowerHits Fighting super-effectively with Psychic FangsHits Bug super-effectively with Flamethrower
Venusaur
GrassPoisonCovers its Grass, Electric, Fighting and Fairy weaknesses
Resists Mega Greninja's SurfHits Grass super-effectively with Sludge BombHits Electric super-effectively with Earth PowerHits Fairy super-effectively with Sludge BombAdds long-game durability
Slowkinggalarian
PoisonPsychicCovers its Grass, Fighting and Fairy weaknesses
Resists Mega Greninja's Sludge WaveHits Grass super-effectively with Sludge BombHits Fighting super-effectively with PsychicHits Bug super-effectively with FlamethrowerHits Fairy super-effectively with Sludge BombAdds long-game durability
Goodra
DragonCovers its Grass and Electric weaknesses
Resists Mega Greninja's SurfMega Greninja resists its SurfHits Grass super-effectively with FlamethrowerHits Bug super-effectively with FlamethrowerHits Fairy super-effectively with Sludge BombAdds long-game durability
Slowbrogalarian
PoisonPsychicCovers its Grass, Fighting and Fairy weaknesses
Resists Mega Greninja's Sludge WaveHits Grass super-effectively with Shell Side ArmHits Fighting super-effectively with PsychicHits Bug super-effectively with Fire BlastHits Fairy super-effectively with Shell Side ArmAdds long-game durability
Metagross
SteelPsychicCovers its Grass and Fairy weaknesses
Immune to Mega Greninja's Sludge WaveHits Grass super-effectively with Ice PunchHits Electric super-effectively with EarthquakeHits Fighting super-effectively with Psychic FangsHits Bug super-effectively with Rock SlideHits Fairy super-effectively with Meteor Mash
Corviknight
FlyingSteelCovers its Grass, Bug and Fairy weaknesses
Immune to Mega Greninja's Sludge WaveHits Grass super-effectively with Brave BirdHits Fighting super-effectively with Brave BirdHits Bug super-effectively with Brave BirdHits Fairy super-effectively with Iron HeadAdds long-game durabilityalso: Skarmory

Steelix
SteelGroundCovers its Electric, Bug and Fairy weaknesses
Immune to Mega Greninja's Sludge WaveHits Electric super-effectively with EarthquakeHits Bug super-effectively with Rock SlideHits Fairy super-effectively with Flash CannonAdds team-wide guard support
Vileplume
GrassPoisonCovers its Grass, Electric, Fighting and Fairy weaknesses
Resists Mega Greninja's SurfHits Grass super-effectively with Sludge BombHits Fairy super-effectively with Sludge BombAdds long-game durability