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The old TOMY figures are worth jack shit- you can get them on various trading forums for 1-2$ each. I just went into a collectibles shop in the mall and they had mint unopened packages of the entire evo lines of Squirtle and Charmander for $11 each.
The only Pokemon merch besides plush that's worth anything are the 1/40 scale zukan gachapon figures, I've seen some of them go for 80+. (pic related)
There are some rare ones though, Ditto, Pidgeotto, Nidorino, and Ghastly just to nae a few.