I know phazes aren't supposed to do damage. That's why they were given very limited access, kind of like Tale Glow. Speed does matter, considering that Dolphure outspeeds basically every other phazer who would be trying to phaze it out (aside from, say Groudon), and when it's not trying to phaze Speed + Tail Glow can get over the top. Just bold whatever you can, added moves, changed levels. If you want to be extra special say what you took out at the end.