I like Jolteon because of the show 'Thundercats', Magnemite because of it being a blob with a slenderman-like face and Rotom because it could be my constantly transforming kitchen. Well those are some of the reasons I like those three in particular at least. :p Jolteon's always been a stand out from other electric types, going off the trail of rodents and inanimate objects. Of course other Pokemon like Zapdos follow this same path too but they aren't as appealing to me. While Raikou/Zapdos definitely had that legendary element to add to their general 'cool levels' I felt like Jolteon was a heap better than them. But maybe that's because Jolteon is the right mix of small, cute, powerful and not too cheesy-looking either. Regardless, it's probably my favourite electric type or at the least, tied with Magnemite and Rotom.
I love Magnemite and Magneton equally. Magnezone definitely tried to step out of the 'throw three clones of x together' concept but it just didn't feel very in place with the magnet family overall. :( While I'll admit that its creativity factor is probably around the level of goku losing to the main villain of db x 9000, (that's really bad by the way ;__;) I appreciate its simple design and it's also kind of cute in a way. :) also slenderman magnets are pretty overpowered so go gamefreak for making them ^^