No, it can never miss.
There are other moves like Shock Wave that have 60 ATTACK Power and unlimited accuracy e.g. Aerial Ace, Faint Attack e.t.c.
On Ever Grande City
Any cave ever.
Ever grande city
Go to Ever Grande
in this game and ruby and Sapphire Scott shows no sign of Pokemon what so ever.
Gloom can be found on routes 121, 123 and in the safari zone on Pokemon ruby. If you are looking for anyother Pokemon, I recomend www.serebii.net they have all the info on Pokemon you'll ever need.
regigigas is not a Pokemon you can obtain in ruby because regigigas was made in diamond and pearl and platinum so you can't get it in ruby ever.
ever grande city with super rod
Pokemon ruby's version IS Pokemon ruby.
You can only receive the other starters from other ruby sapphire or emerald players you can't catch starter Pokemon ever.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
use the superrod in the water outside ever grande city