I'm a fairweather Pokemon fan at best, but I'm with you on Temtem for the same reason; many people don't have the same reservations as you and I, so I thought I'd mention it. I think Cassette Beasts is that game and reviewed well, and to ignore it might be to ignore exactly the game you're asking for, but I'd also point you toward the "creature collector" tag on Steam. I've never heard of Coromon before doing that search to leave this reply, but mousing over it for a second shows a video that proves they know what they're making (87% positive Steam reviews). Same goes for Nexomon: Extinction (92% positive). No one will know what you're looking for better than you, but people have been making games inspired by Pokemon for a long time now.