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Standard or Mega, either are fair game.
Personally I'd love to see a Castform evolution, it's got so many moves and an ability that lets it change type at will but lacks the stats to really use any of it. I'd give it a 100 BST buff and update Forecast to make it a little less slow of an ability:
>Castform Evo
>HP: 80
>Atk: 70
>Defense 80
>Sp. Atk: 107
>Sp. Def: 80
>Speed: 103
>Ability: Forecast
>Updated to instantly summon weather equal to the held weather rock upon switching in and changes form accordingly
>Sandstorm Form added, makes Castform and its evolution a Rock-type during sandstorms