It's mostly from the song Poketto ni Fantajii. It starts out with this, the last word ending right before the title screen comes up:Woman: Hey I wonder What are your dreams?
Girl: To get the 151 Pokemon!
Woman: Oh Just like mine!
Girl: E~? That's odd since you're an adult
Woman: What the heck~ I mustn't?
Girl: It's not that you mustn't but...
Woman: Hey You What other sort of dreams do you have?
Girl: U~h Another dream Let me see...
Some instrumental, then it goes to this from when the pink-haired girl is whispering to Boija-san till the very end:
Woman: When I was still a child,
I had in my pocket many treasures.
Even until now sometimes I peek.
Girl: By any chance is that Pikachu?
Woman: So what is it?
Both: Children of the past Children of the present
The stuff in their pockets no matter when
Boys as well as girls
The stuff in their pockets no matter who
Fantasy
Bunch of kids: Ran-ran-ran-ran-ran-ran-ran-ra-ran
Ra-ra-ran-ran-ran-ran-ra-ran
Ran-ran-ran-ran-ran-ran-ran-ra-ran
Ra-ra-ran-ran-ran-ran-ra-ran...
The instrumental part doesn't really fit with the pictures, to me.
At the end, during the "ran"-ing, someone says, "This summer: theatrical edition Pocket Monsters: Mewtwo's Counterattack. Also playing*: Pikachu's Summer Vacation."
*I think that's what "doujijouei" (同時上映) means.
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