At least 20+ on my old Sapphire. I don't know where it is though, and I think I had Charizard, Blastoise, Venusaur, Typlosion, Feraligatr, Meganium, Blaziken, Swampert, Sceptile, Raichu, Espeon, Umbreon, Dragonite, Ho-Oh, Lugia, Altaria, Metagross, Kyogre, Groudon, Rayquaza... The list goes on and on.