Pokémon Black and White versions

I've heard that you only really need cut and surf to play through the main game. Strength, dive and waterfall are only needed post main game. Fly is, of course, always optional. Though my definition of main game is after the elite four.

Glad to hear this. Surf is a good move anyway, I don't believe you need cut that much(it seems that you only need it for side areas, so you can dump it on a HM slave along with Strength), and Fly can be put on whatever you want to use to Fly(I don't know if I'm going to use a flying Pokémon in my "official" playtrough though, but it seems that in these games it's not that needed anyway). Dive appears to be more of a bonus thing like Rock Climb in HGSS. Don't have a clue on Waterfall, but like Surf it's a good move.