Mega Evolution
Every Mega Evolution in Pokemon Champions
Champions has 75 Mega Evolutions. 41 come from X/Y and ORAS. The other 34 are for Pokemon that had no Mega in that era, which is where Mega Greninja, Mega Dragonite, Mega Chandelure and two separate Mega Raichu forms come in.
Newer Megas
34 Megas beyond the X/Y and ORAS roster
These are Mega forms for Pokemon that had none in X/Y or ORAS. Each gets a full stat spread, a locked ability, and in several cases a type change. These are the ones worth learning first, because no existing competitive knowledge covers them.
Worth knowing before you compare them: Champions gives every Mega exactly +100 to its base stat total, where the mainline games handed out different amounts per species. So the interesting question is never how much a Mega gains, it is where those 100 points land and whether the typing shifts. 15 of the 75 change type.

Mega Raichu X
Electric · 585

Mega Raichu Y
Electric · 585

Mega Clefable
Fairy / Flying · 583

Mega Victreebel
Grass / Poison · 590

Mega Starmie
Water / Psychic · 620

Mega Dragonite
Dragon / Flying · 700

Mega Meganium
Grass / Fairy · 625

Mega Feraligatr
Water / Dragon · 630

Mega Skarmory
Steel / Flying · 565

Mega Chimecho
Psychic / Steel · 555

Mega Staraptor
Fighting / Flying · 585

Mega Froslass
Ice / Ghost · 580

Mega Emboar
Fire / Fighting · 628

Mega Excadrill
Ground / Steel · 608

Mega Scolipede
Bug / Poison · 585

Mega Scrafty
Dark / Fighting · 588

Mega Eelektross
Electric · 615

Mega Chandelure
Ghost / Fire · 620

Mega Golurk
Ground / Ghost · 583

Mega Chesnaught
Grass / Fighting · 630

Mega Delphox
Fire / Psychic · 634

Mega Greninja
Water / Dark · 630

Mega Pyroar
Fire / Normal · 607

Mega Floette
Fairy · 651

Mega Meowstic (Male)
Psychic · 566

Mega Malamar
Dark / Psychic · 582

Mega Barbaracle
Rock / Fighting · 600

Mega Dragalge
Poison / Dragon · 594

Mega Hawlucha
Fighting / Flying · 600

Mega Crabominable
Fighting / Ice · 578

Mega Drampa
Normal / Dragon · 585

Mega Falinks
Fighting · 570

Mega Scovillain
Grass / Fire · 586

Mega Glimmora
Rock / Poison · 625
Returning
Megas from X/Y and ORAS
These carry over from the mainline games. Stats and abilities are worth double-checking against what you remember, since Champions has rebalanced several of them.

Mega Venusaur
Grass / Poison · 625

Mega Charizard X
Fire / Dragon · 634

Mega Charizard Y
Fire / Flying · 634

Mega Blastoise
Water · 630

Mega Beedrill
Bug / Poison · 495

Mega Pidgeot
Normal / Flying · 579

Mega Alakazam
Psychic · 600

Mega Slowbro
Water / Psychic · 590

Mega Gengar
Ghost / Poison · 600

Mega Kangaskhan
Normal · 590

Mega Pinsir
Bug / Flying · 600

Mega Gyarados
Water / Dark · 640

Mega Aerodactyl
Rock / Flying · 615

Mega Ampharos
Electric / Dragon · 610

Mega Steelix
Steel / Ground · 610

Mega Scizor
Bug / Steel · 600

Mega Heracross
Bug / Fighting · 600

Mega Houndoom
Dark / Fire · 600

Mega Tyranitar
Rock / Dark · 700

Mega Sceptile
Grass / Dragon · 630

Mega Blaziken
Fire / Fighting · 630

Mega Swampert
Water / Ground · 635

Mega Gardevoir
Psychic / Fairy · 618

Mega Sableye
Dark / Ghost · 480

Mega Mawile
Steel / Fairy · 480

Mega Aggron
Steel · 630

Mega Medicham
Fighting / Psychic · 510

Mega Manectric
Electric · 575

Mega Sharpedo
Water / Dark · 560

Mega Camerupt
Fire / Ground · 560

Mega Altaria
Dragon / Fairy · 590

Mega Banette
Ghost · 555

Mega Absol
Dark · 565

Mega Glalie
Ice · 580

Mega Metagross
Steel / Psychic · 700

Mega Lopunny
Normal / Fighting · 580

Mega Garchomp
Dragon / Ground · 700

Mega Lucario
Fighting / Steel · 625

Mega Abomasnow
Grass / Ice · 594

Mega Gallade
Psychic / Fighting · 618

Mega Audino
Normal / Fairy · 545
Looking for the full roster instead? Browse every Pokemon in Champions.