Yeah, I suggest this. Emerald on an emulator lets you get all 386 Pokemon through Gen 3 and some versions are considerably tougher. Also no worries about a clock battery.
FWIW I've run Pokemon games on my phone before so they're still portable, but can't elaborate any further.
Help control the pet population. Have your pets spayed or neutered!
RIP Bob Barker (1923 - 2023) - and thanks for all the memories.