Honestly, yeah you could beat it, but youve also got 3 not-fully-evolved pokemon. Growlithe to Arcanine requires a fire stone. Gloom can either evolve into bellossom (sun stone) or vileplume (leaf stone). Onix to steelix uses a metal coat when trading. I *think* these are available pre-e4, the sun stone might be a bitch to get tho

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