Mega Man Battle Network 4 Red Sun

here is the guide copied and pasted from a faq from park area to the battle.

Park Area
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Here, head down the long path, and go down the ramp. You'll easily see Glyde
when you come down - Go and talk to him. It appears the culprit is in deeper
Park Area. Well, let's head to Park Area3 from here.

Here at Park Area3, we'll see a scene of the pervert green Navi telling Roll
that he'll be off to Net Shop. He also tells Roll that if she tries to move,
the Mettaurs surrounding her will attack her. Roll sighs, wishing for Megaman
to be around. Unfortunately, we can't reach the area that she's at, so jack
out and head home to Lan's House. Here, jack into your PC, and head onto the
Net.

ACDC Area
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Here in ACDC Area, head to ACDC Area2 and go to the Net Merchant. Turns out the
stalker is shopping here. Talk to him, and he'll comment on Roll. Megaman will
ask where she is, and the stalker will be surprised. The Navi will then fight
Megaman to try to keep Roll. You'll fight a Weather and two LarkEX in Normal, a
Winger and two BarkEX in Hard.

After, the Navi will give Megaman the RoomKey, which will allow you to go and
save Roll. Now, head back to Park Area3.

Park Area
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Back in Park Area3, take the third ramp up until you get to the darker purple
floor. This time, head down and left, and take the long ramp going up. Continue
left, and open the blue door with the RoomKey. Go and talk to Roll. Megaman
will try to delete the viruses, but Roll stops him, saying that the viruses
like her. Megaman tells her that she should go to Mayl right now, and then asks
Roll if she wants to do their match. Roll will refuse to withdraw, saying that
she's got speed. Lan comments that Megaman probably made her mad, so we'll be
jacking out for now. Back at the ranch, Roll will charm the viruses.

Castillo
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Head into the castle, and Roll will send you an email issuing you a challenge.
Go back to ACDC Town.

ACDC Town
---------
Here, go to Mayl's House and jack into her teddy bear. You'll meet up with
Roll, whom will force you into a game of tag. She has fixed spots around the
field to teleport to, so memorize them and stay in place of one, and you should
easily be able to tag her the necessary three times. After, jack out, and go
back to Castillo.

Castillo
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Here, head into the castle, and then go through the front door. Mayl tells Lan
not to underestimate them, and Roll tells Megaman to fight her at full power.

here you go.