Lyra

What are your team's movesets? As far as I can see,you could keep mamoswine in your team. Gardevoir, and Fearow can also stay, just make sure that your fearow knows moves boosted by the field. Scrafty is debatable. On the one side, he can get field boosts, and if moxie hits in, he could be useful.On the other, if Ciel's pokemon outspeed him (and archeops at least does, not sure about mons before him) he's gonna go down in one hit or two. Sceptile and Heatmor seem kinda useless for that fight so you could probably switch them with something else.

My first was linooine in ruby. Thought it was weird, shrugged my shoulders and K.O-ed it. My first one I caught.... was also a shiny Linooine in my emerald playthrough. Caught that one xD I even found it around the same area as the first one (route 118). My first reborn shiny was bellsprout. The first one that stayed in my team is espurr (now meowstick, and still kicking ass).