I have to laugh really hard right now. I had no idea what this game was, nor what the cover looked like. People have been requesting this cover for about 10 years now and I have always passed it... because I don't collect gameboy boxes, and those boxes that I have are basically Mario games.
So roll around to today and your request... I decide "eh, I'll bite. I'll search the forums and see if anyone has posted this". I see all of the previous requests from everyone and see that it has never been fulfilled. I then go onto ebay (as I usually do as of late) to see how much it would be to purchase and I see that it's $75 sealed in the box... that... has a cover... that is extremely noticeable to me... as if... I own it.
I mean, this is great timing on your point to be honest. The basement has been destroyed over the years (and lack of cleaning during quarantine). I've been moving everything I own out of the basement into the living room to do a complete overhaul of the basement. With all of those boxes moved... I YET AGAIN (same as over the past 10+ years) TODAY (of all days) saw this cover nicely stored away in a collection ziplock baggy with all my other GBA games while moving my crap.

Within that arrowed box was the cover that you seek. It was not hiding away boxes deep, it was legit right there LOL.
Front
https://drive.google.com/file/d/1DFq2EyoQD5zKU6J1xeWN7xKN_TJ5m107/view?usp=sharing
Back
https://drive.google.com/file/d/1Kmvm72w3xrJE1tIFyUMizh0CJXO_bx0j/view?usp=sharing
#FeelsBadMan as I have seen this request soooooo many times in the past lol. hahahahaha, great timing dude.