if you are trying to trade yes. there is a building like pal park on route 15
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The Explorer Kit is from Diamond, Pearl and Platinum. It is not in Pokemon Black or White.
I think pokemon Black is better than the both of them. Still, I liked pokemon Platinum.
Unfortunately, in Pokemon Black and White, you cannot interact, (trade, battle etc.), with the other versions, (Platinum, Silver, Emerald etc.). only with Black and White is where you can interact.
The white flute I think attracts Pokemon. Later in the game you can also receive a black flute. The black flute on the other hand repels Pokemon.
You cannot catch Reshiram in Pokemon Platinum. However, you can get one if you trade with someone that has one from another game like Pokemon Black and Pokemon White.