1. Strange Potions have been around a long ti'me, but are still very rare due to the fact that it is rarity 99 (less than 5 appear in the Magic Shop every month).
2. The Lab Ray can randomly change your pet's gender, amoungst many other things. The Lab Ray can change gender, color, species, Strength, Defence, Hitpoints, Level, and Movement. At the moment, the lab ray is very expensive; 500k or more for the map that lets you access it.
3. Witchy Neggs can, according to the Neopian Ti'mes Editorial (Week 118), 'Changes your pets gender, turn them into a Lenny, Tuskaninny or Moehog, boost their intelligence, raise their hit points or cure any disease your pet may have'. I have no proof of this and the price of the negg at the neggery, 48 Negg Points, is a bit high for testing purposes. And seeing how random it (supposedly) is, I don't recommend it .
4. Kaleideoneggs have some of the effects of the Lab Ray. Not sure which, but not all, though definitely gender and color change. Costs 52 Negg points at the Neopian Neggery.
5. Fight the lab ray scientist in the battledone. He has a strange potion equipped as a weapon.
Note: Changing a pet's gender will not change its' look if you have a gender specific painted pet (i.e. royal)
Edited by Warlord, 14 June 2007 - 01:20 AM.
Added 5th method + note