Okay, Do you know what is a switch?
"Switch" is just like switch in our daily life. It means you can turn on or turn off.
What is the function?
You set an NPC to say "Hello!" when talk to him.
You set the NPC to say "We meet before right?" when talk to him when a certain switch is turned on.
That means, you can set the event to do "one thing" when certain switch is off,
it will do "another thing" when the switch is on.
Hope you understand...
Next, to do the "Slowpoke Well" event, just simply add a new event page on each Team Rocket Grunt and set Conditions switch: "001: Dissappear" ( you can name it whatever you want ) and dont add the character set for it.
Then set a switch in the last rocket event command. I mean click "Control switch">"001:Dissappear"> ok
This means when you fight the last rocket grunt, it set the "001: Dissappear" on.
And the second event page of each rocket grunt is set to "When the switch "001: Dissappear" is on, it turn to this event page".
Do you understand?