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I have a very very marginal improvement, but an improvement nonetheless, on the chatot list: slab and dex over the other fossils. the reasoning is that
1) they can always be played regardless of board space, so you're not forced to potentially give up your helix fossil to cycle the other ones
2) they advance your gameplan slightly more than fossils when combined together with research and pokeball
>dex+research+slab
you can play dex and use slab to decide whether you want to draw your 1st+2nd card or 2nd+3rd
>dex+slab
same reasoning, if the second card you see is the only one left you need you could feasibly decide not to use chatot and instead slab away the first one
>dex+research+ball
an old combo where you can use pokeball as a fetchland + brainstorm
>dex+ball
weaker version of the above, if you're in dire straits you have 2 shots at a crucial topdeck instead of 1
also note that in the latter part of the game chatot acts as some sort of pokeball in terms of synergizing with dex, or put it another way you can have a more informed decision on whether to chatot or not based off dex.
seeing the dragonite list that made me want to try the blastoise version again with 2 wartortle, but it keeps not being good because 5 energy is way too much. I don't believe at all that the nite version is any better because 4 unaccelerated energy seems just as bad