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Mega Meganium:
>Grass/Fairy
Gets bigger, eyes become more slanted, neck flowers become bigger and two of them become wings. Antennae become longer.
Mega Typhlosion
>Fire/Ground
pic related
Mega Feraligatr
>Water
Generic Mega evolution bullcrap. Bigger, spikier, and generally more menacing.
Mega Sceptile
>Grass/Fighting
Blades on his wrists turn larger and pointier, isn't as fat, larger tail, head "spikes" become longer.
No idea what it could look like.
Mega Torterra
>Grass/Ground
Shell gains more rocks, and bushes, and shit, horns become larger and he gains two more of these. Tail becomes bush with rocks sticking out of it.
Mega Serperior
>Grass/Dragon
Becomes longer, "angrier", and gains a badass hairdo. Can fly. Is essentially a Grass version of Gyarados, except it's an actual Dragon type.
Mega Samurott
>Water/Fighting
Moustache/Beard combo becomes longer and more jagged. Stands upright. Swords are longer. Gains a chestplate.