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Also thought it'd be cool if they gave the starters a secondary typing that's another starter type.
Way I see it you can look at that two ways, you can either give them the secondary typing that hey're weak against, so grass/fire, fire/water, and water/grass, and that way you can see it as them no longer being weak to their new typing but now what they're originally resistant to is just neutral.
Or you can give them the secondary typing of what they're strong against; so grass/water, fire/grass, water/fire, so they're no longer weak to what they first were and they also gain 4x resistance to their original resistance.
And yeah those are the same combinations but the aesthetics could be different. A grass starter evolving into a grass/fire would be worlds different from a fire starter evolving into fire/grass
