Monster Hunter Cheats[ PS2 ]
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Code - Rathian/Rathalos Quick Kill Tip: Locking
It's called 'head-locking' and you can do it with almost all bladed/blunt weapons.
You've seen most wyverns flinch, yes? Where so many hits to a certain body part (like wing-locking Gypceros/KutKu) will cause the wyvern to flinch in pain for a brief moment. This goes for hitting wyverns in the face/head as well, and it can be repeated to the extent where they become 'locked' in a repeat cycle of flinching until dead, or until you're in need of re-sharpening your weapon.
Very handy for when you're trying to obtain items/monster parts in a hurry, or begin to play for effeciency especially when taking the Troublesome Pair quest (Rathalos/Rathian in same quest), for those ever elusive 1% chance Los/Ian Plates.
It's recommended that you search out a lance for this method, as they allow for quick successive hits, and lateral movements to compensate for the wyverns being inched back from being locked/flinched. It is also recommended that you build up a lance that has at least 400 attack as it will only take 2 hits to the head of either Rathian or Rathalos to be locked. You can use weapons under that power but will succumb to having to deal with 3 hits and the possibility of wyvern attack if you mess up the timing.
The simple method is to get that first flinch, then have your last attack hit the head just as the wyvern is done shaking it's head from the previous flinch, cause it to flinch again. Rinse, repeat.
Here is a YouTube example (video is not mine, just randomly searched):
I had to make this post here because the other topics I saw listed as 'cheats/tips/hints' were an absolute joke, had nothing to do with anything, weren't even finished topics, or worse. Yes, this is for an old game, no longer with it's online COOP, but deserves an easily comprehendable description.
And, as it so happens. Locking can actually still be performed in all the sequels to date. (to an extent, in some games better than others, like MH3/Tri). I hope this is of some use to any readers or anyone who searches Google for hints.