This question needs more detail. It it entirely dependant on the laws of the country in which the crime was committed, and the seriousness of the offence.
For as long as it takes to find you.
Pokemon with mean look can stop Pokemon from fleeing
Lot's wife looked back when fleeing Sodom and Gomorrah because she disobeyed the angels' warning not to look back, and she was curious or attached to her home and past life in the city.
It will keep fleeing unless you have a Pokemon with Mean Look or something like that so it won't escape. Try catching a wild Golbat. The same is for Mespirit.
We took a long look at the abyss which we had to cross.
"Have a look" is an imperative sentence.
There are no items that stop Pokemon from fleeing in battle in Pokemon soulsilver.Although this is true:You can catch a Pokemon that knows, Arena trap,and/or a Pokemon that knows mean look, such as a Ghastly.
irony
try using the move 'mean look' on it so it cant escape.
Have a Pokemon with the move called Mean Look, which Golbat is a primary choice to have this move. The move Mean Look prevents the Pokemon from fleeing or switching out during a battle and can be very useful in a battle like this. You cannot stop Mesprit from permanently fleeing, however. It is recommended to bring a Pokemon with any sleep status moves like: Hypnosis, Sleep Powder, Yawn, etc. to further the effect.
Block, Mean Look also some abilities like wobbufet has.
irony