The best replacement for leafeon is glaceon.

The best alternatives to leafeon are rated as following:
★★★★★  glaceon
★★★★  roserade
★★★★  torterra
★★★  jolteon
★★★  sceptile
★★★  flareon
★★★  tangrowth
★★  gogoat
★★  sawsbuck
★★  serperior
★★  abomasnow
★★  meganium
★★  glaceon platinum
★★  umbreon
★  venusaur
★  vaporeon
★  lopunny
  roserade better
  lilligant

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Speaking about leafeon, one probably shouldn't forget about eevee.

Other search terms related to leafeon and their ratings are:
★★★★★ eevee
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leafeon
glaceon
roserade