I read your request again. Tip on the Magmarizer; if you save next to the Treasure guy on Route 13, he will eventually hand one to you if you ask him over and over. This applies for Black/White only. Took me half an hour once, but I eventually got something I wanted from him.
In B2/W2, an Ace Trainer is in that spot and gives you Flutes instead, which can be taken to Undella Town and sold to a maniac for several thousand PD each. Here, the Magmarizer can only be found in B2 on the Plasma Frigate, and not in W2 anywhere. I have W2 also. The reason this item exclusivity happens is because Magmar's line is B2-only, and Electabuzz's line is W2-only (so it's the Electrizer instead).
If you have W2, what I can do is clone the Magmarizer I have from Black using a clone Pokémon code (it will hold the item, which I can then retrieve). I can then attach it to a Pokémon (perhaps a III/IV starter, though if I breed one I'd have to hatch it first). This is exactly how I'm going to get my own Magmarizer in W2 as I have a Magmar standing by.
I'll get back to you on the other half of the trade before trading. I have to figure out what I could use. ;)