Q30: In the rake rules, it states: "A monster with the rake ability must begin its turn already grappling to use its rake". Pounce states: "When a creature with this special attack makes a charge, it can make a full attack (including rake attacks if the creature also has the rake ability)." Can someone clarify this? (The rules in question are below)

Rake
A creature with this special attack gains extra natural attacks under certain conditions, typically when it grapples its foe. In addition to the options available to all grapplers, a monster with the rake ability gains two free claw attacks that it can use only against a grappled foe. The bonus and damage caused by these attacks is included in the creature’s description. A monster with the rake ability must begin its turn already grappling to use its rake—it can’t begin a grapple and rake in the same turn.
Pounce
When a creature with this special attack makes a charge, it can make a full attack (including rake attacks if the creature also has the rake ability).