Extremespeed's accuracy is 100%, so it's not likely to miss. It is, however, affected by user accuracy and enemy evasion, so it IS capable of missing.
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Close combat but it also depends on the level and the Pokemon doing it.
A move that lets you attack first if the opponent doesn't have a higher speed and using a move like quick attack or extreme speed.
Dragonite doesn't learn extreme speed through level up, nor from other pokemon by egg breeding. The only way to get a Dragonite with extreme speed is from HG/SS version in Dragon's Den, after giving the old geezer guy inside the right answers for his test. If you answer correctly he'll give you a Level 15 Dratini with extreme speed. However, giving him a slightly wrong answer he'll give you a regular Dratini.