It's exactly what it looks like, an English Translation of Pokémon Gold. There are numerous examples of good old engrish in the game, right off the bat and a few story differences. For one, several of the character's dialogue is much more direct and heavy on exposition, like for example the lady standing in front of Elm's Lab (who originally complemented your Pokégear) telling you that said lab was directly north of them. Another example early on is Elm himself referencing a Great Trainer by the name of ASH who caught all 151 Pokémon. The naming system in this game is a bit flawed, being restricted to only five letters in a name. (A holdover from the normal Japanese version with a five character limit) You'll be treated to some somewhat raunchy jokes that didn't make it through the American localization, and what with the misspellings and off grammar you'll be getting a few good laughs. 

An addicting game like Pokémon Gold with more humor? I'd recommend giving it a go if only to see how wacky the dialogue is.