Not technically the same but have a bro whose is Kyogre, which is a refreshing and really good choice. Brought him the Primal plush for his birthday back in the ORAS days.
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So I asked a combo of kids i babysit for, kids at the school I teach at and friends kids to gather analytics. This is what I found;
Out of 15 kiddos 7 said Pikachu.
Then we have Bulbasaur, Charmander, Charizard, Mewtwo, Snorlax, Chimchar, Torchic and…somehow…Mr. Mime. 
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I wanna meet the kids that said Mr. Mime, that is hilarious. Did they have a reason for that choice?
I make my daughter say Charizard all the time but she really loves Pikachu lol
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My 2 year old niece saw my Pikachu socks and said: “Cat!!”.
We are far off…
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My cousins kiddo really took an interest to Diglett but only because he thinks he’s a piece of poo and calls him poops.
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-____-
Pikachu she calls it kika
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I believe the reasoning is because he was in the detective Pikachu movie. But still!
One day during lunch at the summer theatre I worked at we went around and asked everyone who their favorite Pokemon was.
Charizard, Pikachu, Eevee were probably the top 3. One kid said he liked Hitmonlee and another said Bulbasaur. Fennekin and Sylveon were also mentioned. Can’t remember the rest. We had close to 50 kids.
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Thanks for the responses and continued replies. Looks like Gen 1 holds on strong for the most part 
Bulbasaur being somewhat more popular than I remember
Pokemon Go, Evolutions, Detective Pikachu and the other Pokémon movies (I choose you and mewtwo strikes back evolution) may have played a role in this. I’ve worked with kids for the past ten years and sold a lot of cards to moms in the past few years and there were times when Gen 1 was less popular (besides Pikachu).
If I may contribute a little to this topic: I remember a girl asking for Arceus cards and a boy looking for buzzwole. Definitely the more odd choices. It’s typically more like lycanroc, charizard, greninja and the likes.