Depends. Are you planning on running mega cross? Also for yanmega, maybe something like
Bug buzz
Air slash
Protect/ancient power
Giga drain (if you can get it)/ancient power
Yes, I'm planning on running mega cross.
And since my Yanma/Yanmega has Ground HP, I'll teach it Ground HP if I am unable to get it to learn Giga Drain. Thanks.
Also, If you had a RNG Captured Male Gengar with Ice HP, would moveset would you give it on Pokemon X/Y after transferring it from Pokemon B/W? (If you were trying to a Mega Gengar)