He is telling u go find his teeth at the safari zone. It is at the far side of the safari zone where you find the HM 03, which holds surf.
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It doesn't evolve until Generation 4, so it's no use trying to get it to evolve in Generation 3.
the giratina in firered are super rare, so it might take you a long time trying to catch it. my recommendation is that to hunt around in grassy areas futher on in the game, my friend caught one, so it's not immpossible!
It is possible you are trying to trade Pokemon from the hoenn region (ruby, sapphire, emerald) onto firered/ leafgreen. This is not possible until have done a certain thing. The other possibility is that you need at least 2 Pokemon to trade.
You have to go to the safari zone and go to the area where houndour is. Miltank is level 37 and is very hard to catch. im still trying =P hope i helped :)
The only way to get it is by the safari zone which makes it harder to catch it there really is no easy way to get it so when you find it i suggest trying to capture it as soon as you find it.