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1. D/P - Slow battle style killed it for me, forgettable characters. Platinum was a great improvement.
2. R/B - Buggy and shoddy even for their time, broken battle mechanics (wrap, focus energy, speed crits).
3. G/S - Despite it being the one I have the fondest memories for, the slow level curve kills it for me. You get to Mahogany Town and there's nothing to effectively grind on. And then in Kanto all the Pokemon go back to being low levels, and the region is gutted and squished.