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Glaceon & Leafeon are my favorite eeveelutions but I've got to admit Espeon is probably the best fuck. No slippery skin, no frozen genitals, no plants, no burns, no electric shocks, no dark energies, etc. Espeon can use psychic powers to also make it feel more pleasurable by directly beaming that pleasure into your mind, like having mind-sex in adition to regular body-sex.
Of course, this is just talking about eeveelutions. The best pokemon (in terms of male human and female Pokémon breeding) is probably something else entirely but I really don't care.