LOT onix fits with both rain dance and energy trans... and charizard's effect too. seems obvious.
Venusaur is likely meant to bench sit, and 'stoise hitting for weakness caps at 120HP exactly they new what they were doing when they designed these cards back in the day.I think box sets meant to be standalone game experiences are a great idea, so something like this works as a cool nostalgia version of something like Battle Academy. Featuring the starters is an obvious choice, but it does raise some questions about the gameplay feel. Charizard hits Venusaur for weakness while being hit by Blastoise, so both matchups could end up imbalanced. Luckily, Blastoise is weak to Lightning rather than Grass, so I suspect that will be the "default" play experience.