@Crimson Flame@zeroSH nicely posted, i aim to have a reply by friday!
edit: also, zero, your Happiny is allowed to have all of the egg moves in addition to their level up moveset. so go ahead and add egg moves to the move list!
@jujube so, a lot of times i use pokedex entries to try to create scenarios or problems to solve. (as long as those entries make sense... the whole macargo being as hot as the sun is something i wouldn't take too literally, for example).
I'm also kind of winging this as I go lol honestly i don't really have a good way of giving a hint. i'd say you can just try different ways of looking for sobble or attracting it. like maybe it has a favorite food/ berry. just have fun with it, honestly. you don't have to worry too much about it, as i will help guide the scene. :)