I think you get what you want when you jump the gun as it happens.
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I also did not hesitate to give my L30 Bite/HP Gyarados a Fast TM. My other Bite/HP Gyarados is L22; considering whether to power him up.
This is one thing the Safest Bets article got wrong. Vaporeon is now outclassed as a Water-type attacker, not by a Gen 3 species, but by Gyarados!
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I'm still going to find plenty of uses for my AT Vaporeon. No regrets about investing in that. (I've always liked using AT.)
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Vaporeon has still some use (e.g. double rock Golem) and in my case I have 5 strong (91%+ lvl 35.5+) Vaporeons, while I have only 1 Gyarados with WF/HP at that lvl with good IVs and 3 others with good IVs that need some investment to come close to/surpass my Vaporeons.
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I've just evolved my Magikarp... Waterfall + Hydro Pump!