I already tried opening it up with tile layer pro and it doesn't work, I got this message.

MEKA has a VRAM viewer that will tell you the tile values. In fact most emulators with debugging functionality have some sort of graphic viewer that let's you view a screen broken down into tiles etc.
Relative searching is nothing more than an educated guess. It's really only useful when you have no tools to help you in an emulator.
Yea I looked at MEKA weeks ago but didn't like the interface but I'll probably have to get used to it, I sadly also don't know how to find out the values of the tiles from using a VRAM viewer so could you help me out on that. I just need to find the CLAMP letters hex location and their tile codes so I can then build a table from it, please help me out on this as I don't think I'll be able to solve it myself.

I need to find out this here for this game for the gamegear, below is the tile codes for the 2nd rayearth game for the gameboy. I would use the tile codes like so and then find out the location of the text and then build a table.
B7 = A
B8 = B
B9 = C
BA = D
BB = E
BC = F
BD = G
BE = H
BF = I
C0 = J
C1 = K
C2 = L
C3 = M
C4 = N
C5 = O
C6 = P
C7 = Q
C8 = R
C9 = S
CA = T
CB= U
CC = V
CD= W
CE = X
CF = Y
D0 = Z