Objectively, what is the best starter in every main series game?

Question

I really want to know which starter does best in every game because I have my opinions and theories, but I'd like to know the facts of the subject.

WE WILL REMOVE ALL ANSWERS THAT DON'T:

1. Answer in terms of which starter makes completing the game most efficient and hassle-free
2. Explain specifically why the others are not better options
3. Address every main series game
4. Stay on-topic and avoiding giving irrelevant add-ons, like the team you used in your playthrough

Comments

Swampert in gen 3 for sure

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In gen three, it is Swampert but it has a neutral matchup against most of the game

In gen four, definitely Infernape. Fire types are not that common in gen four so that's already a point in its favor and it has incredible high based damage stabs. It's also really fast so that's something and has priority mach punch, which you will rarely need but useful in the early game

In gen five, I think it is Oshawott for the same reasons as Swampert. It mostly has a neutral matchup with the exception of the electric gym

In gen six, I think it is Chespin. I'm not sure on that though

In gen seven, I'm not sure about this but I would say whatever the water type is since it gets the fairy typing and water is a very good type

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Neutral matchup? It beats Roxanne, Wattson, Flannery, and Liza & Tate which it’s STABs. It also has coverage for Winona, Sidney, and Glacia. It also learns a bunch of HMs which is helpful.

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Oh in that case Swampert has an even better matchup than I first thought. If that's the case, then Swampert is definitely the best. Now that you mention it, the only thing that Swampert has to worry about is one Roselia somewhere. I can't exactly remember where it is. I think it was in the desert

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Are gym leaders and the Elite 4 really all that you need to worry about in a playthrough? Rival battles and other significant battles exist, too, but not a single person has mentioned anything other than gym leaders and the Elite 4 in their answers.

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No. I don't think any of the answers are good.

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I'm going to remove all the answers to this question that don't give full explanations.