Use the moon stone on the clefairy if you want to evolve it to a clefable, not attach it to the clefairy. Your alakazam should be able to carry you through the rest of the game if you level it higher now, as well as your machamp and your Torterra; your clefairy is alright, except you're playing like how I did in red and blue.

Instead of loading it with moves that are around 100 in power and 'favourites' like that, give it sttacks that are around 70 in strength by the same type; they get times'd by 1.5 in strength when you use it. For example; your torterra has razor leaf and earthquake. earthquake's power will actually be 150, not 100. 1.5x. Razor leaf will be 82.5 if you use it straight off the bat. BUT. If you get your torterra into 1/3 of it's health, due to it's special ability, it will multiply by another 1.5x damage to 2.25x damage. a 55 strength razor leaf has now become an 123.75 monster.
But the fun doesn't end. If you equip an item onto it like a miracle seed or a meadow plate, it'll get another 1.5x added onto that 2.25x. 3.375 times the damage, if you're under 1/3 hp. In other words, an 185.625 strength razor leaf. You can't do that with a thunder, can you?

and behind Torterra's attack, it will rape almost anything.
Also you're up against the version legendary after the galaxy leaders, it's at level 48. Be prepared.
Oh yes, get that haunter traded, trained with some good moves and it'll be as good as any legendary.
and now, a taste of my post E-4 team. Thank Arceus for the pal park.
Lv. 71 Gardevoir @ Shell Bell
Lv. 60 Torterra @ Meadow Plate
Lv. 61 Salamence @ Amulet coin
(still a major work in progress, salamence is NOT a special attacker)
Lv. 60 Luxray @ Zap Plate
Lv. 56 Alakazam @ Mind Plate
Lv.71 Palkia @ Lustrous Orb
and I also have my starter from emerald,
Lv. 69 Sceptile @ Miracle Seed
