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All in all, only two cards were banned: Agent of Treachery and Fires of Invention were banned in Standard format and suspended in Historic format

Though this is a reliable source of Treasure production, Goldspan Dragon most notably states that rather than producing one mana of any color, when sacrificed, its controller's treasures produce two mana of any one color instead

But if your question is, What unofficial, licensed cards first had Pokemon on them? then sure, you can look at non-TCG products like Bandai Carddass

[14] [15] [16] James Whitbrook of Gizmodo characterized the community response as "heated" due to the aftermarket value of the banned cards and their "popularity in competitive play"