It is PTC (Pokemon Trainer Club) account, which is the best solution when it comes to buying accounts directly.
The name of the trainer in the game can be changed. You can also link your email address to your account/Facebook/Apple ID.
You can also choose your team in the game, if you want to of course.
Once you buy your account, you will get it right away with your login and password automatically.
Before logging into your account, we recommend that you log out of your account and wait 3 hours before logging into your newly purchased account to avoid a ban.
As for the Pokémon in the account, they are random, with random CP, which also applies to their quantity.
