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>Mega Kingdra
Shaped more like a gun with huge seaweed coming off it. All offensive stats and speed skyrocket, all defensive stats and HP plummet.
>Mega Omastar
Pic related, ability changes to Drizzle.
>Mega Rampardos
Becomes thinner and more hunched; head looks like a cannonball and body bears a cannon motif. All of its SP attack goes straight into speed. Ability becomes Rock Head.
>Mega Bastiodon
Gains castle parapets and a lot of weight, also wears a portcullis like a hockey mask. Ability changes to Wonder Guard.