Iron Tail
Secret Power
Dig
Crunch
Maybe add a Citrus Berry too
Hyper Beam?
Mightyena doesn't learn the move crunch in Diamond and Pearl. I think it does in ruby sapphire and emerald.
Keckleon Mightyena Lombre Poocheyana learn the move by themselves!!
I think its Crunch or Dig or Double edge or Earthquake. I can higly recement Mightyena, for your Pokemon team!
The pokemon move. ( It's super effective)
earthquake
any fighting type move
icebeam is super effective
Any rock type move will be 4* effective, or hyper effective against Ho-oh.
Any fire or flying type move will be "super effective"
ghost and bug
The only way I know of to get a super effective hit on spiritomb is to have a Pokemon use foresight on it and then attack it with a fight type move.
its on route 112 after you go to meteor falls on route 114 and then the two magma grunts will move and then you fight maxie with a level 24 mightyena, a level 24 zubat and a level 25 camurupt.