Occasionally, you'll even see a 1-0-1 line, also. But the most common line for a main attacker is 3-2-3. Some lines that can take a Stage 2 evolution from their normal and EX self will go 4-3-5 (4-3-3/2).
If I remember correctly, Lv. X's will have to be dealt with differently in the new format, and I'm interested to see how it works. So, just to make sure I'm right (And if I am, this is to anyone who's reading and doesn't know), the Pokemon count as having the same name as their original selves, correct? For example, you can't have 3 regular Emperte and 3 Lv. X Emperte because that would total to 6 of the same Pokemon, and of course the max is 4 (Unlike EXs, Dark, and so on). So I'm wondering if people will try 3-2-3-1 lines if they wish to include them, since 3-2-2-2 lines seem too inconsistent to pull off.