Eventually, Mega Man decided to go after Charge Man first, thinking that he'd have an easier time tracking a robot master down in an outdoor area, rather than an indoor one. Thankfully, the data file on the Robot Masters that Vinyl had provided included teleport coordinates to each of them, so he didn't have to calculate that himself...and he knew Vinyl would never set a teleport coordinate that would drop him into lava or anything like that. It wouldn't be very sportsman like.
Upon arrival, he found himself inside what looked like a massive train station, quickly disabusing him of the 'outside is easier' idea. Seeing trains in the distance, he made his way forward to see what awaited him. The first enemy he encountered was a flying, Mettool-like construct that dropped three bombs as it flew straight forward, a simple enough affair to evade as he moved towards what looked like an office-type structure within the station.
Eventually, he reached a ladder letting him climb to the upper levels of the structure, which he took to find a clue where Charge Man might be. Instead, it turned out the ladder took him atop a train that immediately started as soon as he stepped onto the top of the back car. Atop the train, he encountered train-Met bots, charging towards him and shooting at him. He continued forward until he found a path that let him get into the train, dropping into the next car.
The car appeared to be a grocery car, filled with crates of food supplies and guarded by large chicken bots that sent eggs marching at him and rat bots that scurried back and forth. His charged shots proved best for dealing with each, letting him make his way through the cart to get back atop the train.
"In, out, in, out," Mega Man grumbled to himself. "Makes me feel like there's a joke I could make here somewhere."
The top of the train was guarded by more train-Mets, along with bulkier bots that launched round bombs at him. Once past them, he dropped down into the engine car, where he found a rather large red bot guarding a sealed door. The large bot could only be damaged on its head, and shot homing missiles at him out of a torso compartment. Careful jumping and shooting took it down, unsealing the door.
Charge Man turned to face Mega Man as he entered. "You're late! You're late! This is a very important date!"
"Sorry," Mega Man apologized. "It took me a while to decide which of you to go after first-"
"But Vinyl left a weakness order for you, with a promise of no Freak Chips!" Charge Man pointed out.
"...I missed it."
"Ahhh!" With that scream, Charge Man charged Mega Man, racing towards him.
Mega Man leapt over the charging train Robot Master, shooting him from behind. Once he'd done that, he waited and watched as Charge Man...slowly walked towards him. "Is that all you can do?" he asked, surprised.
"I can do this!" Charge Man shouted, shooting flaming coal to fall down in a random pattern...nowhere near Mega Man. He slumped in on himself. "We weren't really designed for combat..."
"In that case, how about you just gimme your Master Weapon chip and go back to doing what you're supposed to be doing?" Mega Man offered.
"I am running late as is..." Charge Man admitted. Smiling, he tossed a chip to Mega Man and beamed out.
Mega Man smiled as he installed the Charge Kick weapon. "So that's what Vinyl meant about beating them without destroying them..."
As the chart showed that Wave Man was the one vulnerable to Charge Kick - and in fact one of the only ones who even took damage from it - he went after him next. This left him just inside the water treatment plant, where some of the systems were still damaged from the Roboenza outbreak. Cracked pipes in the floor occasionally released bursts of pressurized steam, while spiked balls swung back and forth on chains. However, very few robots patrolled the corridors.
The only point of interest that Mega Man encountered early on were large pipes that sucked him down if he got too close to an open end, which proved to be the only way to advance in certain areas. The danger was in choosing the right pipe.
The next area, Mega Man found bubbles coming out of the pipe floor, some large enough to ride up to the top of the structure, which proved necessary due to the absence of stairs or ladders. This led him up to the top of the facility, letting him walk out over the roof. At the edge of the roof was the massive reservoir, with a jet ski resting at the edge. Mega Man promptly hopped on. "Here's hoping this is fun rather than tedi-OOOOOOOOOOUUUUUUUUSSSSSS!"
Apparently, Vinyl had decided she didn't want Mega Man to be bored. Instead of the trip across the reservoir being a leisurely cruise while dealing with the occasional robotic buoy, it was a high speed obstacle course reminiscent of a stage of Battletoads, complete with ramp jumps that were easy to screw up and crash out of the reservoir on.
As he reached the end, Mega Man was glad to get off the jet-ski. "That...was..." After managing to catch his breath, he thrust his hands into the air. "AWESOME!" Rushing forward, he leapt over a turret that guarded the final door, coming face to face with Wave Man.
Wave Man glowered at him as he entered. "So...you have come. Well, you will not leave-"
"Boot to the head!" Mega Man shouted out, using Charge Kick to slam into Wave Man.
Wave Man fell back, clutching at himself. "That...wasn't my head..." he whimpered.
"I meant the nautical term," Mega Man explained.
"That doesn't even make-"
"Boot to the head!"
"I'm out!"
Mega Man caught the weapon chip as Wave Man beamed out, installing Water Wave. "I think Vinyl should have upgraded these guys before sending them after me..." He paused as a realization hit him. "Unless that's deliberate to give me a false sense of security, and the new ninth Robot Master is going to be severely overpowered...oh dear..."