I learned the hard way that Heal Block isn't actually as solid of a response as Ban Seed since Heal Block is classified as a normal status ailment, so Mewtwo will recover from Heal Block quickly at very inopportune times. Ban Seed on the other hand turns Mewtwo into a relatively simple fight compared to other legendaries since Aura Sphere and Psystrike aren't anywhere near as threatening as stuff like Sacred Fire, Blue Flare, Fusion Bolt/Flare, Spacial Rend, Dragon Ascent and all those other fun signature moves that have obnoxious range.
I'm actually not sure if bosses have the same PP limits that other Pokemon do though, I know in one of my early attempts I had set up like crazy with Giratina's Ominous Wind boosts and he just would not stop using Recover even after using up all of my Elixirs. Either way I would not recommend trying that either, Ban Seed is the way to go.
I'm actually not sure if bosses have the same PP limits that other Pokemon do though, I know in one of my early attempts I had set up like crazy with Giratina's Ominous Wind boosts and he just would not stop using Recover even after using up all of my Elixirs. Either way I would not recommend trying that either, Ban Seed is the way to go.