[Naix]

XAkaviri, take Hatred the Togepi. When Hatred was in its egg, a mishap occurred that caused it to be emotionally inverted, causing it to mercilessly attack whatever it comes across (can't switch out, always under the effect of Taunt. Metronome doesn't count as an attacking move) and also because of the mishap, Hatred despises everybody, but you in particular to the point where it will accept absolutely no items from you and will attack its teammates in double battles.

Now, you're probably thinking "How is Hatred supposed to evolve if Togepi's means of evolution is happiness?" The answer to that is it won't, unless of course it successfully soloes the Rocket Grunt in the Kimono Dance Theater (yes, that's what it's actually called) and later the Kimono Girls themselves. The reason for this is because the Kimono Girls are the ones who originally posessed the Togepi egg. After defeating them, Hatred must lead your party when you go to the Whirl Islands to battle Lugia. (Note: Hatred does not have to battle Lugia.) In case you're wondering why, the dance the Kimono Girls perform there is not only to awaken Lugia, but also as a purification ceremony, much like in Pokemon Colosseum and Pokemon XD's Agate Village. In other words, when the Kimono Girls are performing under Whirl Islands, they are essentially "purifying" Hatred, causing it to become a normal Togepi that loves everybody and everything, allowing it to evolve.

Now that Hatred has been purified, it decides to refute its own ways, meaning that every restriction it had as a Togepi is now reversed. (it will accept items from you, it can only have one attacking move which it cannot use unless it has used its other moves in the same battle, will never attack its teammates, is able to switch out) Also, Hatred decides to change its moveset entirely (Note: the amount of attacking moves Happiness can know is the opposite of how many it had as a Togepi. For example, if it had 3 attacking moves as a Togepi, it can only have one as a Togetic, and if it had 2 as a Togepi, it will have 2 as a Togetic.) and change its nickname to Happiness in commemoration of this. Finally, to prove that it loves you rather than hates you, it soloes an Elite Four member of your choice. After that is completed, Happiness may evolve again.

Have fun!