He runs faster than any other girl in this team.
1- Delete "other." He is a male, not a girl, so using "other" is inaccurate.
2- It should be "on" this team rather than "in" this team.
Better: He runs faster than any girl on this team.
No other plant is more beautiful than this.
Since you are comparing this plant to other plants, add "one" at the end.
Better: No other plant is more beautiful than this one.