Day 23: Do you Hyper Train your Pokémon?
I've never had a need, so no.
Day 24: Do you Shiny Hunt yourself? What is your favourite method?
Shiny hunting and myself have a complicated relationship. I've tried just about every method other than Pokeradar. The easiest for me was horde hunting or Friend Safari because I didn't have to pay much attention. Chain fishing, Dex Nav, SOS, and even sometimes Masuda Method get really boring for me. I lose focus early, get bored, and often break my chains. I'd much rather trade for my shinies off the hard work of others. >_<
Day 25: Have you completed a Pokédex in any game?
The first game I completed my Regional Pokedex was in Black. The first game for my National Dex was in X. I completed it while I was writing my master's thesis. I would take a break from writing (my thesis was over 140 pages) and play some Pokemon. It was a lot of work, but I'm so happy to have done it. Now I just drop everything into my new games to complete the dex right off the bat.