Shego said:
No doubt about I bet that Vivi will try to spoil their relationship so she can have him for herself.
Here's a little scene that can dipict what could happen...
Ash and co. are heading to the next town, and on the way they meet up with an old friend, Vivi Winstrate.
Vivi: Hi, guys!
May: Hey, Vivi.
Ash: It's good to see you again.
Max: Hey Vivi, guess what! I'm an official trainer now?
Vivi: That's great! So am I! (She finally noticed Jirachi there)
Inner Vivi: WHO THE HECK IS
SHE!?!?
Max: Oh yeah; this is Jirachi.
Jirachi: Hi Vivi.
Vivi (thinking): Don't worry, Viv. It's okay... it's not like they're together or anything.
She notices them holding hands.
Inner Vivi: AAAHHHHH!!!! THIS MEANS WAR!!!!
Vivi is grinning widely and the others are wondering way.
Jirachi: Max?... Why is she looking at me like that?
Max: Hey Vivi?... Are you alright?
Ash: This is starting to feel familiar. I don't know why though.