Whic Move Tutor moves were you most thankful for from Heartgold and Soulsilver? These are just a few I like:
Ancientpower-gave my Meganium type coverage
Headbutt-Based on the point of the game this move is accessable, it's very useful in and out of battles.
Aqua Tail-Very useful attack for many pokemon and only 40 BP
Seed Bomb and Signal Beam-same as Aqua Tail
Heat Wave, Outrage, and Superpower-ery powerful and helpful attacks
Sucker Punch-a very useful attack in Wifi battling
Magnet Rise-useful for stuff like Raikou and Aggron, among others
Synthesis, Tailwind, and Last Resort-not the kind of moves you see in battles too often but they're still cool.