>>35454008>Only one pokemon>Never going to be a good trainer At this point you'd just getting a pokemon to be a friend/pet/guard dog. However, if you just poof'd in to the pokemon world one day, you'd have no way to survive in that world by yourself and for all intents and purposes wouldn't exist. Getting a job wouldn't be an option.
You'd need to get a pokemon to help you survive, no rental pokemon. No question. The best pokemon for survival be an HM Slave or a pokemon with good utility moves. Discarded pokeballs seem to be common enough but you'd still have no real way to weaken any pokemon that you find.
So, which pokemon is most likely to just let you catch it, not attack you, not run away and makes a good HM Slave? Slowpoke seems like it probably wouldn't even realize you're trying to catch it until it's already caught. But Slowpoke offers very little in the way of utility moves outside of HMs.
Grass or Electric Types have access to very useful status moves like Sleep Powder and Thunder Wave. One of these Types wouldn't be a bad pick either.