This might not work for you because I tried it on my friends game and it didn't work but Goop works well against Knights,Vulpimancers(Wildmutt) and Silver Knights.
Enemies 2
Echo Echo works well against everything except Vulpimancers(wildmutt),flying creatures and Gorvan(the tetramad)(the four arms).
Far Jump
If you're having trouble jumping to ledges out of reach then just turn into Chromastone and in middair press A and you use his special attack that should take you further.
Health
If you're down to really low health then find a place where you won't get hurt and turn into ben for about 3 to 4 minutes and your health should be recharged.
Techadon
If you're having trouble defeating Techadon use Echo Echo because he is to small to be hit by the lasers but if you get to close he'll kick you but if you are far enough away press A. Now before he starts flying and shooting at you stay still until they're just about to hit you then run to wichever end is further away from you and wait and if you think a laser will hit you jump. If you see he is launching bombs do the same thing.
Wildvine
You will get to a point where you have to fight a wildvine (from the original series)who has been turned into a DNAlien and you have to fight it using Echo Echo and first round is pretty easy but you have to destroy 4 x-pods before they hatch so there are two on the ground but then there are two up high and the only way to get to them is to run jump from the other side and jump up two platforms that crumble after you step on them so jump quickly. If you get all 4 of the x-pods before they hatch a platform should appear under the wildvine jump on it and use A until it wakes up then in the second round do the same thing except wildvine throws at you not hard but it is irritating if the pods hatch cause these little purple things are all over you so either turn back into ben and punch it of or if you are ben turn into Echo Echo and press A and it will fall off. The third and fourth ronds are hard because in the third round if you've done everything right then these huge vines come out of him its hard to dodge them and run jump an meanwhile he's still throwing bombs but even faster! and in the fourth (and maybe fifth if you didn't do that well ) He throws them faster but only slightly and the vines are going faster to but I defeated him and im just 10.