Tekken Tag Tournament 2

I was trying out FoX XBL's technique and found a slightly easy method.

Same level: Stage 4 Boss Battle.
just Foward + Y then X,X,X,X,X...
The more hits you land the better.

I get 50,000+ pts. and around 180,000G every time
P.S. That Yellow guy is a pain in my ass

I got a video of what I'm doing below

Super Combot DX Complete
You unlocked all the content in Fight Lab.

First off let me start this by saying that you dont need to S Rank any of the Stages in order to get this achievement.

While going through the Fight Lab Stages you'll gain Upgrade points. With them you can buy new moves for your Combot. For this achievement you need to buy all the moves from the Combot-Tuning section of the Fight Lab. The Level Tech you dont need since you can't buy them, they are awarded for getting certain ranks in the boss fight, and are not needed for the achievement. You'll need approx 2.5 million (i don't know the exact number) to buy all the moves. I found Stage 5 Boss Battle to be the best place to grind out the points. You can get up to 75.000 upgrade point per run that takes 2 - 3 minutes. Just try to get as many hits as possible during the combos, and not get hit you that way you can get up to 400pts per hit.

Hope i could help and sorry for my bad english.

Boss Stage 4
Forward+Y over and over again. Make sure there's a half second pause after the initial hit before you do it again. Once you hit it the 2nd time you can just spam it until you beat them. First boss is the only one who could roll out of the way. Stages go by ridiculously quick, I always got 70k+ or 32k. Never understood what I did differently each time but this is the fastest way in my opinion :)

I'm not really that great at fighting games. But doing this way helped me get this achievement in no time. So thought I should add this solution.

This achievement is done in the Fight Lab section within the game. I will try to be clear for all this, so I will break this down into different parts for you.

Fight Lab (Combat Tuning Section)

Here you have to buy all the moves within each section, total of 8 moves sections (You can see the percentage of the moves you got so far here). I don't know the exact amount of development points but I would only do up to 2 million and then see what is left to get (I'm saying this cause you don't want to do more than you have to, I did by 300,000 :( ).
You don't need to get the moves you can unlock for this.

Rate of Earning Development Points

For me I got on average 35,000 development points in the space of less than a minute and within half a hour I got more than 1 Million and that's with me sometimes messing up and taking longer cause I lost focus. So you can get an idea of the time needed.

The Solution

Alright for this you want to pick Boss Battle 4. There is three bosses to get through but should not cause to much problems, maybe the first boss might, the Fat Yellow Power Ranger (I hate him, was a pain sometimes).

Yellow Power Ranger

This guy is the only one I have to go into detail for, so I will break this down again.

Boss Moves:
Wand to change your head - that's okay use this attack to get closer to him to hit.
Bouncing Attack - For this if you time it right you can get him into your chain of attacks starting it of with Forward >Y.
Laser Gun - This is hard one to get away from you can sidestep by double tapping Up or Down.
Throwing Food Box - The same as above.
Chucks Grenade - If you have the right amount of distance you can jump over it.
Nunchucks Move - Not to much of a problem you can get a Forward >Y attack in there to start the chain of attacks.

This guy likes to fire the Laser gun or throw his Food box at you to get distance sometimes consistently if he does this to much and there's a big distance just restart on the pause screen to get things moving again.

Now as the fight starts you want to move close to him as soon as. You want to press Forward >Y (Uppercut) and B (Kick) (Doing a kick right after hitting him before he falls to give you the time gap needed) then press Forward >Y again and again if needed B again for kick and let the cycle continue.
The other way I did against him was Forward >Y and B for kicks getting about 3 or 4 before he hits the ground then sometimes as he hits the ground and bounces a bit you can get the Forward >Y attack in again and again.

Boss 2

Easiest boss here as soon as the fight starts all you want to do here is Forward >Y again and again making this a fast easy one.

Boss 3

This is not to bad of a boss either as fight starts Forward >Y and B, followed by Forward >Y again and again (If you press the Forward >Y and the bear sometimes lands on the ground with his back towards you then this is even better for you as a well timed Forward >Y can trap him in the Forward >Y again and again chain of attacks).

That's it guys hope this helps :)