in terms of levels, the strongest pokemon in the wild is a lvl 70 volcarona in one of the bottom rooms in relic castle after u have beaten the main story once
The starter Pokemon are never encountered as wild Pokemon.
Poochyena cannot be found in the wild in Pokemon Black. You must trade to get it.
You cant
keldo is an event pokemon and you cannot get it in the wild
lillipup and patrat
If you transfer one yes. Pikachu are NOT wild Pokemon in Black and White.
It can repel wild Pokemon upon use.
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Due to White Forest, White has more wild Pokemon than black
You will need to trade for it from Pokemon Black or White to get Pikachu. It cannot be found in the wild.
You can't since there're no wild Pikachu in pokemon black and poketransfer blocks pokemon holding items
Deoxys is an event pokemon and cannot be found in the wild in Pokemon Black or White, unless obtained from a previous generation.