Normally, in this situation, I'd say "what on EARTH are you talking about", but because I've played a game where you need to rescue a medicham, I'll try to help. I am guessing that you have red/blue rescue, right? So, all you have to do is go to the Wish Cave, which is one of those "Accept the terms or you can't come in" places. go in, and go for it! Try, and try, until you reach Floor 20. THAT is where medi. is, not Floor 99, that would be Jirachi. They will say "Thank you" and you get a wish stone, which i believe you need to get the wish.Take in only the essential items, as its gonna be a toughie.
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You can either evolve meditite at lvl 32 or you can catch them in mt coronet (but not on the ground floor)
You find Gligar in Pokemon Platinum at Route 206. You can't FIND IT IN PEARL.
if the charmander is the Pokemon that ur gonna trade then no. if you are the one with medicham then yes. charmander is more rare then medicham.
there is no such thing as a hippopotamus in pearl I think the question was supposed to be: "How do you get Hippopotas in Pokemon Pearl?" The answer is: You find it in Maniac Tunnel.
You can get a Houndour in Pokemon Pearl by breeding it from a Houndoom, which you can find on route 214 and 215.
You can not find them you can only train them to 50.