New to the game , what do i need to look out for?

Basically title,

I'm a longtime pokemon fan, i played 10 years of competitive tcg (at the highest level), i dipped into vgc altho at the time i was more focused onto tcg and i didn't want to comit the rest of my freetime into even more. Now that i stopped playing anything competitive (be it sports or tcg) i have a lot more time to spent on and while i spent most of my time for league of legends there is still a lot of free time which i plan to spend on pokemon pro. I plan to play this game casually while still dipping into competitive (pvp).

I did play pokemmo before (so this is not my first time playing pokemon on an emulated and customized plattform), and i generally wanna know what is the difference between this and pokemmo (if anywone would be so kind to tell me)?

If there is pvp , what is usually played Solos or doubles? Also are we using tiers (Ou etc)? Is there any balancing happening towards pvp? Are frequently held tournaments a thing? Is there something like Guild Tournaments or even Guild rankings?

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I already joined the Discord , and i am planning to look through the different links (atleast those which i think are needed) , I plan to start the game casually (first playing the storys) and stream it and then transition into pvp (just like many would play mmos).

What do i need to look out for? In pokemmo they changed spawns of some pokemon considering Johto and Sinnoh were not playable regions but the pokemon were still implemented (sinnoh pokes only partially). did they customize spawnrate (considering IV farming etc) ?

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I have already red that xp share/gold coin (anything that makes farming more reptitive but easier) is not implemented and i think that is great (atleast understand the reasoning behind it). I don't quite understand why breeding is not in the game (it would make it more of an mmo i think maybe someone can clear this one out for me).

How do people farm for their pvp pokes? I remember reading something about spawns and tiers on this forum which i don't understand , is there some kind of explanation for me aswell as a map/list of all spawns maybe a tier list that someone made?

For now these are all my questions im probably gonna have more during my playtime , hope someone can help me and thank you if you take your time to read all this.