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to promote the Unova ones. I'm at Castelia City and I have Servine, Psyduck, and Koffing. Servine is fine, but Psyduck could be stronger, and Koffing always does terrible. Until it learned Clear Smog (weak move), its only poison move was Smog (crappy move with 20 power and 70 accuracy) but at least it knows Assurance. Thank God Psyduck just learned Water Pulse, it's getting stronger.
Conclusion: they are still promoting Unova Pokemon and they encourage and want everyone to use Unova Pokemon, so they purposefully nerf the older ones to make the Unova ones more appealing to use. I kicked butt in White 1 with all my Unova Pokemon since they were literally overpowered, but this game definitely hates gen 1 fans.