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I have to admit, I don't have the dedication to balance stats, natures, strengths, and all that. I build my teams based primarily on element and how often I've used the Pokemon in prior teams. I use my starters as tanks until the Pokes I want are strong enough to manage on their own, and then set the starter aside to build full custom teams.

I've also finally come to the realization that I should check which Pokemon learn which HMs before I put my team together, so I've now got teams planned out that require no more than one side Poke to cover for HMs necessary to get through Victory Road. I do have one team in planning with no Pokes who can learn Fly, but I can manage well enough without it.

And I've long since come to terms with my habit of getting my a** kicked by the Elite 4 with custom team plan-fail xd

I find a pokemon or two that I like, and for sure want in the team. (Example, Gengar)
Then I decide whether I want all of the other pokemon to be the same type as the afformentioned pokemon, the Same theme, ( Like making a team of Ghost, Dark, Poison and Psychic, [They just seem to mix well for me]) or if I want it to be a team that would be ideal for serious battling, with a variety of types.
The first two options provide more for "Backstory", but the third one is obviously much more useful.

In the end, I can never decide, and out of frustration,
stop playing for a week.
gonk

I catch pokemon that are strong or will become strong to get through the storyline and only worry about EVs afterwards.

When building a team, I basically rely on covering as much types as I can. I don't really do that thing with the natures and the EVs. . . I just like it simple.

My team ends up just coming together by the time I'm at the 4-5th gym.

When it comes down to it, I usually try to expand a wide varitey of different types of Pokemon with different types of attacks so that I'm put at a semi-advantage (though in some cases I can be put into a corner) and yes I LOVE to breed my favorite Pokemon and have their EV's perfectly in place because that's just me. I also hate legendary Pokemon just because.

For in-game teams I generally pick out the Pokemon I like, and ones I need to have an advantange. Most of the time, I like to do it in advance, though sometimes I'll run into a Pokemon and think: Oh! Haven't used that one before! Wonder what it's like! biggrin I've already started planning out my HG/SS team... sweatdrop

Hey, now. Grass is pretty freakin awesome, considering it's strong against ALMOST all other types. Well, a lot anyways. Like electric, water, ground, rock, metal, fighting, etc. Even though fire is my favorite type, grass is probably of the strongEST. 3nodding heart