journey again to achieve the another battle called the 8th gym Pokemon ruby
to the 8th gym :p but seriosly i think u go to stooplis meaning u have to go under water about west form mosdeep
use dive in the dark water then go into a cave. ue dive again and you should be in sootapolis city
Wattson the electric gym.
In the 8th gym. he is the gym leader
journey again to achieve the another battle called the 8th gym Pokemon ruby
In Pokemon Sapphire, Ruby and Emerald the 7th Gym that's located in Mossdeep City has Psychic type Pokemon.
Use strong water or dark type Pokemon
sootopolis city, after u awake rayquaza. the gym leader is juan, changed from ruby/Sapphire Wallace
If You Wanna make up the last gym of ruby or sapphire then just take your default Pokemon and level it upto 65 to 70 lv then take kyogre and rayquaaza on the second and then the most powerful Pokemon you have.
Pokemon ruby where is the 6 gym
the seventh gym is at sekka city
You have to surf from Lilycove to Mossdeep city so you can challenge the 7th Gym Leader, The psychic twins, Tate and Liza.
a swampert, lombre, or sceptile. if you don't have one then use a water or grass type
petalburg gym
With the seventh badge in Pokemon Ruby version, you can control caught or traded Pokemon up to level 70.
mossdeep city, to get there, surf east from lilycove also it is a double battle because they are twins Gym Leaders Tate & Liza