I've never liked Glalie's look to begin with. The big eyes, the huge overbite... It looked... weird. A bad type of weird.
Now it has a mouth that will devour my very soul.
D:
It was also an overall mediocre Pokemon, and in the original RSE he was one of the only 3 Ice Types you can get in the main game because Hoenn is a Tropical Region. In turn the Sinnoh games initially had 2 fire types but even though Platinum made Sinnoh colder they added more Fire Types because everyone hated the lack of fire types and one of the Elite 4 members was a Fire type guy and barely had 2 in DP.
Ironically Glacia in RSE had a similar problem but she did waht Lance did and had multiples of the same Pokemon unlike Flint in DP.