at chapters
There is no legendary Pokemon in Challenger's Cave. One NPC mentions that one Pokemon was raised there. It is most likely to be Keldeo, but it does not live there any more.
In Nimbasa City (city north of the desert that has the 4th gym), go into the building northwest of the Pokemon center and a NPC (Non-Player Character) will give it to you.
For wild, catchable ones, it is Cottonee, Gothita and Vullaby. Cottonee however can be traded from an NPC in Nacrene City. Then as well as these, the legendary Pokemon Tornadus and Reshiram are Black-exclusive.
You cannot catch a Cottonee but you can trade a Petilil for one in either Nimbasa City or Driftveil City I am not sure which one. You can also trade with a friend who has Black. It is the other way around for Black.
I have beat the game and have not found any trainers with a mawile.
Genesect is a legendary Pokémon which means no NPC trainers will be holding one.
an npc Pokemon is a Non-Playable-Charecter. if your realy stupid, a Pokemon that you cant use.
There is no legendary Pokemon in Challenger's Cave. One NPC mentions that one Pokemon was raised there. It is most likely to be Keldeo, but it does not live there any more.
You cannot make your flag black. It is a barbarian city, or NPC (non player city). NPC's have black flags
To change your appearance in Pokemon Platinum's Union Room you need to talk to an NPC in the Oreburgh Pokemon Center. The NPC in question has the appearance of a Psychic trainer.
In Nimbasa City (city north of the desert that has the 4th gym), go into the building northwest of the Pokemon center and a NPC (Non-Player Character) will give it to you.
I am pretty sure that a some NPC gives you Charmander when you beat a certain Gym, the NPC should be in the same city, its the same for bulbasaur and squirtle, there are 3 different NPC's outside 1 or 2 gyms that give you the Pokemon if you defeat the gym leaders. I got Bulbasaur by defeating (?Lt. Surge?) and talking to an NPC in the same town.
For wild, catchable ones, it is Cottonee, Gothita and Vullaby. Cottonee however can be traded from an NPC in Nacrene City. Then as well as these, the legendary Pokemon Tornadus and Reshiram are Black-exclusive.
Talk to the fisherman NPC in the Pokemon center near the entrance to Union Cave.
You cannot catch a Cottonee but you can trade a Petilil for one in either Nimbasa City or Driftveil City I am not sure which one. You can also trade with a friend who has Black. It is the other way around for Black.
No NPC trainer is known to have Manaphy. It's generally only in special end-game battle arenas where NPC trainers are seen with legendary Pokemon. Unfortunately Manaphy doesn't seem to be a Pokemon that turns up in these arenas.
Ralts is unavailable in Black. There are many ways to get one to black, however. Transfer one from a Generation IV game (Diamond, Pearl, Platinum, HeartGold or SoulSilver). Trade one from White (Ralts is available via white forest if the appropriate NPC is present.)