How should I improve hints and tips for Pokemon Ruby

How should I improve

What I would like to say is that I have played all pokemon games and know every weakness of every type.

Such as darks weakness is fighting and bug or ices weakness is fire and fighting (Blaziken).

I have only three pokemon and I'm training for the elite 4 how should i improve my pokemon and what ones are good for me to use here are as follows:

Skeptile lvl 52

focus punch

leaf blade

earthquake

solarbeam

Groudon lvl 50

iron tail

bulk up(gonna teach him eruption)

earthquake

flamethrower

Wailord lvl 50

surf

ice beam

water spout

water pulse(gonna teach him hydro pump)

That's it thanks for hearing me out on my first hint(more like plea) and if any trouble in finding odd pokemon eg gren marill say mysteryman...

PS. could you go yo johto and kanto when you find mirage island

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