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earthquake is in Ancient Castle (in the desert), post e4 i think. stone edge is in the cave on the route directly west of the 8th gym city. again this is post e4
@Redneck: It's the whole first cave (off route 3)that you reach in the game (team plasma grunts are in there). At first you only have access to a small portion, but once you get surf you can reach the lower levels.
You literally can't skip it, you get it just before you enter the mines from the Champion (orange hair guy)after you defeat Cheren. You're nearly up to it.
EDIT: You have to go up the tower of heaven(?) and beat the flying gym beforehand though.
Basically yes, its useless for at least the first half of the game, and then when it has access to phyical STAB, it is outclassed by the likes of Aaken (who you get at a very respectable level).
With Lucky Egg its a lot easier to level up though compared to HGSS. Kibago will have Dragon Claw, DD and Dig/Brick Break nearly straight away which basically lets it deal with anything. Can also teach it X-scissor and Shadow Claw to help take over half the elite four.