increases your Pokémon's Speed statistic by an amount equal to its
initial value. Thus, the first use of this attack results in double the
normal Speed score. The second use results in triple the normal Speed
score, while the third use results in quadruple the normal Speed
score. Effects are cumulative for a maximum of three uses. Further uses
have no effect.
Note that like other statistics, Speed has a maximum value of 999. If a
use of this attack would raise your Pokémon's Speed beyond 999, it will
instead raise it only to that value. If its Speed has already reached 999,
this attack will fail.