No. They have great synergy, but just no. There are way better Pokemon to replace it. there are only like 4 great eevee Pokemon and they are jolteon vaporeon espeon and umbreon. Leafeon is pretty good but there are way better tanks. I would suggest using a regualar team. They get outclassed for exampe flareon is supposed to be a physical attac right? It has a poor physical movepool and other Pokemon can outclass it. take heatran for exampe. It isn't a physical attacker, but it has high special defense ike flareon and high attacing stats. Wouldn't you rather use heatran than flareon?