Which region you would start in?
Hoenn because you get to travel to Kanto & Johto. Which means longer travels, more people to meet, and more battles.
What would your trainer outfit be like?
Well... to explain it. I would have a tank top on, coated red with a black leather jacket with a giant Pokeball logo on the back. I'd wear dark blue jeans clipped on with a Pikachu snapback onto my belt strap. As for shoes, red Vans.
What Pokemon would you start out with on your journey?
Froakie because its 3rd evolutionary form is so epic in both appearance & battle. I feel like we would get along wonderfully as a dynamic duo by training vigorously day after day with breaks if he's tired ofc. He's a ninja. Ninjas train hard. :P
What kinds of Pokemon you would catch and train?
Dragon, Steel, Fire, Grass, and Dark types. All for coverage; switch-ins when needed. I plan to be unstoppable with my Pokemon team.
Would you battle in Pokemon gyms, or Pokemon contests?
Most definitely. I wanna be the very best like no one ever was. The best at battling, the best at Pokemon contests. Contests would greatly benefit my battling skills because each style comes in a variety of ways to decimate your opponent. Think about it, your opponent is probably just commanding attacks without a sense of combining another attack I laid out for them because they're inexperienced at that kind of stuff. Guess who has the advantage? Me because I know to boost my Pokemon's attack strengths.
Would you travel to other regions? (if so, which ones?)
I would travel to all regions just like Ash is doing although I don't plan to immediately move into another a region if I lost the conference league. I'd train harder so I can re-enter & body the competition.
Would continue to use the same Pokemon from your first region party for other regions? (If not, what new Pokemon you would catch?)
Since Greninja would be my traveling Pokemon, I won't be needing a Pokeball for him unless there's danger where it needs to back into a Pokeball for safety.
What do you think your rival(s) would be like?
Hopefully, it's a girl with the same burning passion so the both of us can work harder & try to beat one another. Maybe a little * ;) ;) *
Would you have any travel companions?
Of course. You see, from what I learn from the Pokemon series & manga, having friends by your side is pretty important if you don't wanna suffer from loneliness or that you don't know how to do things so your traveling buddy who is experienced can help you out. They'll be there to have your backs no matter what, and you should expect to do the same.
Would you run into and try to stop evil teams such as Team Rocket? (or any evil organization you would prefer)
Oh, believe me. If I run into some constant trouble involving the same evil organization trying to take my Pokemon 24/7, I'll make sure they won't do it again. It's a warning for them. Unlike Ash, I'll actually get them arrested for good. As for stopping a major evil organization altogether if I ever travel to see one, let's say this is in my top "Must Do" list. If they successfully take over the world, then there won't be another Pokemon to catch, friends to have time with, or any travel whatsoever. However, this depends on what their goal is.
Would you travel often?
Mostly likely. It's to keep your stamina up & for getting fit
Would you trade any of your Pokemon?
Sometimes, yeah. It depends if my Pokemon is okay with it. I'm putting their needs before mine
What sort of strategies would you use in terms of battling or contests? (either or)
My strategy is to use some sort of new moves by inspecting the environment I'm battling on. For example, if on a rocky terrain, Earthquake or Sand Attack would greatly profit in this battlefield. I could smash the ground with an Earthquake so the rocks would rise up and from there, I can use my Pokemon's speed to maneuver through the flying rocks & swiftly strike my opponent.
What would you hope to accomplish during your journey?
Badges, reputation as an elite trainer, and beat every regional champion in existence. Along the way, I'll maybe catch some legendaries, but it'll take some skill & research to know if they're safe to catch because if I did manage to catch a legendary, there's a chance that the world would be unbalanced due to their legendary Pokemon not being able to help it. Oh... and girls. Don't forget girls.