Goh’s Grookey doesn’t evolve? Why?

I knew that Goh’s Cinderace and Inteleon had already fully evolved. However his writers refused to let his Grookey for a Rocket Prize Master Pokémon middle or fully evolve, now I wonder why?
Answers
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i do not like that too. It would be fun to see Goh with all the fully evolved starters.
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yeah they should’ve let it evolve
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I would say grookey has the mentality of a baby for starters.
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if you’re not gonna evolve your Pokémon, then why even get it?
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I guess it all circles back to why Ash never evolved Pikachu. Maybe the writers thought Goh should like Grookey as it is. Like having a little brother for Cinderace and Inteleon. Grookey does act very toddler like in the anime. 🤔
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Marketing/comedy. Same reason for Oshawott, Piplup, Chespin, etc
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"Merchandising…. where the real money from the movie is made." ← favorite Movie quote of all time. Cookie to those who can name that movie too ;) Anyways, the reason Grookey stays as a Grookey is purely because the base form sells more than the middle or the PvP monster that its fully evolved form happens to be. That and they can do "comedy" things just like with Dawn's Piplup or Ash's Snivy + Oshawott.
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