What should my 6th pokemon for my team be?

First off let me just say the reason why I'm still playing emerald is because I'm playing it on my iphone plus this is my first time playing in this generation. But anyways my team on my emerald so far is blaziken lvl 38, vibrava lvl 36, gyarados lvl 37, nuzleaf lvl 37, and manectric lvl 37… Just can't seem to figure out what I want as my 6th pokemon yet.

Most pokemon teams involve using a pokemon in order to 'halt' or 'block' other pokemons attacks, more or less like a walling method.

I would suggest using something sturdy ~ And since you have no flying types yet, I would Suggest a Skarmory ~ Or if you are looking for a wall of sorts, a Wailord.

What a nice team! All of your Pokémon have more physical attack than special attack. Use a special attacker! Also, replace Gyarados with a special water attacker. The only STAB moves it gets are special, and Gyarados has terrible special offense. Try Dewgong!

Pikachu

It's seems as though you're going for an all out physical attacking team… Since it's ingame (not for competition) i would highly suggest you getting a pokémon that has high defensive stats and offensive stats, a pokémon that can take a hit, and them BHAM! Knock your opponent out 'til next week… I would recommend using an aggron for this, since it's defense stat is crazy off the charts, and has alot of attack power, other pokémon you could use are pokémon like wailord/rhydon etc etc… Ofcourse, there's also another way you could go… By getting a *special attacker* (i would recommend this) so this basically means pokémon who are above average in terms of special attacks such as pyschic… One of my favourite special attackers has always been alakazam… Though, since you are playing it on your phone you can only get kadabra, but nonetheless, it's still an amazingly awesome pokémon to have… It's defensive stats are abit low, but it does have high sp. Atk and speed… Keep recover and pyschic and you're good to go… Throw in a move like calm mind to increase it's sp. Atk… Also, if you want to be cautious, reflect is a good move to have to cut the amount of damage taken by physical attacks.

Since i don't know what moveset your pokémon currently have… I would suggest the rain dance/thunder combo for manectric… You see, thunder on it's own has an accuracy of 70… But when you use rain dance and then thunder, the move will have 100% accuracy… (so long as rain dance is in effect which is usually 5 turns) i would also suggest getting an ice type pokémon (for the eilte 4 dude)… Keep in mind that the hail/blizzard combo is the same as the rain dance/thunder combo.

Other than that your team is awesome!