Type: Psychic
Effect: User loses 50% HP and maximizes Special Attack
Snatchable: Yes
Damaging: No
Learned by:

Charmander
Charmeleon
Charizard
Kadabra
Alakazam
Dragonite
Mewtwo
Mew
Cyndaquil
Quilava
Typhlosion
Blissey
Ho-Oh
Lugia
Celebi
Blaziken
Meditite
Medicham
Deoxys (all forms)
Jirachi
Darkrai
Arceus
Victini
Woobat
Swoobat
Mienfoo
Mienshao
Tornadus
Thundurus
Reshiram
Zekrom
Kyurem
Genesect

That is too many pokemon that can learn a quite strong move.