Six Flags

DGHTEN
DUNDERBOL
DUNDERBOL
DZNUNJX
DZNUNJX
EVPBPORG
FONQUISTADO
GBYGRETRVFG
GHUBASC
GHUBASC
GHUBASC
GHUBASC
GN GEIZN
GN GEIZN
GN GEIZN
GTEAMTN
GTEAMTN
GTEAMTN
JYRVTUEVQR
RINDERSTE
VAYMAK

Hints

How do I start this puzzle? The way these names have been altered may seem arbitrary or random, but they are not and should be familiar to you. The name of the round this puzzle appears in might give you a hint.
This puzzle is too researchy! Is there a way to limit the search space? There are 6 six flag theme parks used in this puzzle, each with 2 rides, so if you have found just 1 in that park, try finding another from the rides there.
I got all the transformations, now what? Once you've found all the rides, you should have a set of colors and shapes. Can you think of a way to assemble these shapes in a way that's thematic with the puzzle title?
I have 6 letters, but I am missing an ordering, and my letters don't anagram well! Order alphabetically by six flags theme park name. Then recheck your V.