What was up with that Pokemon Diamond bootleg mascot?

You might be wondering what the title of this page means. Well, in the Game Boy Color days, a little pair of games known as Keitai Denjuu Telefang: Power Version and Speed Version were released in Japan. These games were riding on the coattails of Pokemon's success, and indeed, take a lot of inspiration from Pokemon - but I would not in any way call it a "ripoff". It's a unique experience with some quirks all its own, such as the concept of calling a monster on a cell phone in order to summon it to battle rather than catching them in little balls. Oh, and did I mention the monsters actually take a few turns to show up to the battle after calling them? A strange example of realism in a Pokemon-like. And in case you're wondering, no, the creatures themselves are not known as "Telefang" - Telefang actually refers to the act of making the monsters battle, and Telefang's equivalent of Trainers are known as Telefangers, or T-Fangers for short. The monsters themselves are known as Denjuu, a portmanteau of the phrase "keitai denwa", the Japanese term for cell phone, and "juu", meaning monster.

But that's not what this page is about. In the early 2000s, someone attempted to translate these games into (very, very broken) English and release them as long-lost Pokemon games, titled Pokemon Diamond (no relation to the real Pokemon Diamond title released later by The Pokemon Company) and Jade. Pokemon Jade just used the likeness of Princess Mononoke's forest spirit as their cover monster, but Pokemon Diamond appears to have its own custom mascot specially drawn for this occasion, pictured above. My question is this: Where did this creature come from? Who created it? And... why? The creature, of course, appears nowhere in the actual Telefang games and seems to serve no actual purpose besides serving as the mascot of the fake "Pokemon Diamond". The Wikifang article For Pokemon Diamond and Jade even states that the elusive snake creature is of "unknown origin". I'm not convinced even the bootleggers knew at this point. Unfortunately, I don't have the answer to this question, but it's a mystery that has plagued me ever since I first discovered Telefang's existence on the Pokemon fansite known as TRsRockin back in the day (where it was thoroughly mocked for the broken English it featured). If you think you know, please, please reach out to me so I can update this page.