Right, but some pokemon's HAs only exist through transfer, namely the Gen IV and III starters (event Torchic excluding), and some pre-Gen VI fossil pokemon. It would be cool if they had events for those, save the trouble of genning them. What would be cool is an HA for Deoxys where it can go into either form at will, kind of like Stance Change. Attacking moves go into Atk form, priority and/or entry hazards go into Speed form, status moves go into Defense form, you always start at Normal form.