I've gotten 6 on Platinum. For every game, I've had 15.
Blue Version - Blastoise (Blastblast... How I miss him and his Hydro Pump)
Silver Version - Chikorita (Silver), Misdreavus (Midnight), Quilava (Volcano), Feraligatr (Chompion), Lugia (Aerosmith... yea, he's named after a Band), Raichu (AC/DC, also named after a band)
Sapphire Version - Kyogre (HydroShark, he's on Platinum now), Eevee (Tails, never evolved and never will. On Platinum Now)
Platinum Version - Shiny Glaceon (Union, Favorite Pokemon I've ever Had), Absol (Moonblade), Mightyena (Alturiak), Misdreavus (Midna), Empoleon (Neptune), Shiny Gallade (Blade)