ShinyChamp123

Did you defeat the battle frontiers also?  They are also to be defeated then only you can catch legendary Pokemon. If you want to check if you can catch legendary pokemons then go to your "view/edit Your profile".scroll down. There will be messege written about you are able to find legendaries 
Like this: -
You ARE able to find legendary Pokémon currently.
You have defeated all necessary gyms to find legendary Pokémon on the maps
Hope it helped
 

A Pokémon needs 73 points to gain a heart. The exception is the last heart, which only takes 35 points. All Pokémon that need happiness hearts to evolve need 3 hearts (220 points). The exception is Sylveon, which needs 4 hearts (255 points). Sylveon is the final evolved form of Eevee. Since happiness points per battle is randomized (1 or 2), players would need somewhere between 37 to 73 battles in order to gain 1 heart for their Pokémon. Happiness is not reset when a Pokémon is traded.

The hat cannot be shadowed either the eyes and some parts will be black but some major parts will not be highlighted black..or shadowed....

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Gl

Nope you cannot
You have to beat every facility like the gyms the frontiers the regional champions then only you will be able to get leggies and UBs 

Well there is no 'trick' to find Arceus....You just have to suck it up and search for it on the cave map....(i skipped a shiny and a dark,I still feel srry for it )