Z-A has the opportunity to introduce the first new Mega Evolution in a decade, so which Pokémon should make the cut?

Arceus made some fantastic changes, but it had one glaring flaw. Now, fans are hoping Legends: Z-A will set things right.

Should I use this or vanilla pokeemerald for my hack? The main advantage of using vanilla pokeemerald as a base is being able to link with other official GBA Pokémon games for battles and trading, ...