that is an opinion, but i think blaziken has more power than sceptile.
Roselia, Bellossom or Sceptile.
treecko it evolve into grovile which evolves into sceptile
Sceptile's leaf blade
Everyone lieks Mudkipz!
The best starter Pokemon in Emerald/Ruby/Sapphire is Torchic. If you level it up well, it'll sail you through the first 3 gyms with ease.
The grass is the best, because in the end, you will need him a lot! It is though only based on preference (But i heard you like Mudkipz)
Treeko(Sceptile) is the WORST!! starter in Emerald, because its weak and only learns 1 good move. Torchic(Blaziken) is very fast and strong and good for fighting the Pokemon league, and Mudkip(Swampert) is sorta slow but really strong. Grovyle is really bad. Sceptile is a little faster than faster Blaziken but so much weaker. Sceptile has low Defense, but the foe can't attack at all if Sceptile KO's the foe with 1 Leaf Blade(his only good move but it wont KO with 1). Treecko, Grovyle, and Sceptile have one type(which makes them even worse!), you can have 5 other Pokemon in your party to cover Sceptile's type-disadvantages. Swampert's and Blaziken's dual-types make them vulnerable to more types(which makes them better). you don't get 2 STAB types for Sceptile as you would for Swampert and Blaziken, you need a second STAB type. Overall I like Mudkip, then Torchic and then Treeko but Treeko is definitely the worst
Torchic, it can learn Sky Uppercut which attacks even Pokemon that used Fly
-Azumarill -Magnetric -Breelom -(A flying pokemon) -(a normal, fighter or psychic)
the best is either mudkip or torchic because of their evolutions mudkip= swampert torchic=blazekin
in my opinion they are rayquaza,ditto,latios,your starter pokemon,aipom and anorith hope i helped
you should train a water Pokemon or teach your treecko rock tomb