There is Kyogre and possibly a Latios or a Latias.
you cant. you only can in emerald, sappire, and ruby
17 or16
There is no pastoria in Pokemon Sapphire
grumpig
Kyogre
with wings
you must have Pokemon fire red or leafgreen Pokemon emerald or sappire or ruby and Pokemon silver or Pokemon gold then migrate them
you already have it built into your bag!!!
you need to migrate it from sappire
You get dive in mossdeep city
Route 120 (rare) weaken it with fighting or bug type moves then to get health in red, whittle it down with ghost or dark moves
its evolved form, masquerain