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Key to the City offers a lot indeed but it does have some subtle issues

You can only use this effect of "Parl, Hermit of Dark World" once per turn

This still leaves you with the chance to evolve multiple Pokemon per turn, so long as they only evolve once

Cyclonic Rift Possibly only coming in second to Sol Ring for the most iconic Commander card ever, Cyclonic Rift is an inclusion in pretty much every blue deck, and its quite surprising its currently only worth $23

If my commander is four or five colors, and it is not light on creatures, I will play Bonders Enclave

For the utmost benefit, you can attach this ring to halflings like Frodo, Sauron's Bane or Erinis, Gloom Stalker