The strongest pet on green

[Videri]

There is no required level on those quests (hardly any quests actually have required levels). You can get the focus items at level 1 if you can buy all 4 turn-in items. They're all available from other players and you can probably put together the plat pretty quickly.

You probably want all four eventually. You could get them in some priority order, like maybe stein shovel torch broom? Or shovel stein broom torch? Whatever pets you use the most, probably.