They all belong to Gym Leaders on Platinum. Magneton belongs to Byron, Haunter belongs to Fantina, Jolteon belongs to Volkner, and Cherrim belongs to Gardenia. Also, none of those Pokemon were on the Gym Leader lineups on D/P.
3DS Friend Code
Fire with Magmar, Slugma, and Braixen. Please PM if you want to add me.
Crobat, Golem, Magnezone, Butterfree, Spheal, Luvdisc, Charizard, Xatu, Sableye,
Shinies obtained from GTS/Trades
Parasect, Glameow, Chansey, Deoxys, Lugia, Machamp, Linoone, Spiritomb,
Skuntank, Foongus, Aron