Firstly, yes Bodhi is a mini Arceus and we definitely won't see it become the level of Arceus. I personally don't like the part of stories where the character transcends dimensions and tries to become an immortal God or something. I decided to write this story to have a character whose story ends in the same world on a happy note. So, Bodhi will not be able to stand above Arceus. It may have a crazy lot of abilities due to its type but it definitely isn't strong enough to defeat Arceus. Cosmic type was introduced to help it have some advantage if it ends up fighting the legendaries.
Secondly, I'll come up with a few new Pokemon which aren't a part of Pokemon franchise. I'll give explanations as well. We'll see quite a lot of eevolutions apart from those in anime.
Thirdly, the Ash Ketchum of this story would definitely be a lot stronger than Ash, but let me make this clear, this story won't be about an unbeatable trainer with a record of hard fought but certain victories. He'll lose in leagues often, but that doesn't mean he won't win any league. As I mentioned, it's about becoming the greatest trainer, not a champion. Losses are a part of a journey, so yes, Ash will lose battles.
Lastly, he will become champion of Kanto, Johto, Hoenn, Sinnoh, Unova and Kalos before heading off to Alola, the reason being I haven't seen Pokemon Sun and Moon, particularly because I was put off by the animation which seemed to make Ash a kid with two small moustaches, and I currently don't have the availability of time to watch it now. So be prepared to see his reruns at leagues of these regions to become the Champion trainer.
Now I plan to ask everyone what their opinions are on the final occupation Ash decides on settling:
1. A champion of a region. Personally my least preferred as you can't be a champion for a long time, unless all the trainers after you are worthless, which is definitely not the case.
2. A Pokemon Professor like Professor Oak.
3. A gym leader at a new gym in Pallet town.
4. A Frontier Brain at Pallet town.
5. The Principal and teacher at a Pokemon trainer's school to groom future trainers for their journey so they don't turn out to be douche bags like Paul from Sinnoh. Yes, I personally hated him to the bone and was extremely angry at the creators of anime to show Ash's subsequent defeats against him.
That aside, I don't have any other options in mind. I'm open for suggestions but I may or may not adopt them. I apologise in advance for that.
The next chapter is underway and will be out in a few hours.