Thunder can inflict more damage but it misses often, Thunderbolt inflicts decent damage and has 100% accuracy but that doesn't mean it will never miss like Shock Wave.
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It will learn "Thunder" (with an attack of 120 and accuracy rate of 70), a far better move than "Thunderbolt", at level 61. But it does not learn "Thunderbolt". You can, though, give it a "Thunderbolt" TM =)
leveling up: thundershock growl tail whip thunder wave quick attack double team slam thunderbolt agility thunder light screen
Metagross cannot learn Thunderbolt. Metagross can learn only two Electric-type moves; Magnet Rise and Thunder Punch. Magnet Rise can be taught by using a Move Reminder NPC. Thunder Punch can be taught by using a Move Tutor NPC in the various Pokemon games where they are available.
Thunder Wave, Thunder Fang, Thunder/Thunderbolt and Protect. Thunder Wave is a good because it can paralyze any Pokemon (and cannot be evaded) and the Pokemon it paralyzes has the chance of not attacking until it is healed (Good to use against Pokemon it's weak against; dragon, grass and electric. However, against another electric Pokemon, it sometimes may not work.) Thunder Fang is a powerful move, and it also can inflict paralysis. It may also cause the foe to flinch (making it not able to attack that turn). Thunder/Thunderbolt is a "last resort" move and should be used when necessary; you only have 5-10 moves. And Protect is a good move if you're battling a strong opponent, also if the other Pokemon has a type advantage. Note: Remember, electric type moves don't effect ground-type Pokemon, so it's best to battle with another (such as water or grass; which is strong against ground-types).
I would say Psychic, Fire blast, Thunder, and Blizzard. ^wow ur funny -.- fire blast, thunder, and blizzard? they're easy to attack miss i would rather teach him flamethrower, thunderbolt, and ice beam.