The only moves Ryoga has shown are multi-ball strikes and Destruction, neither of which will be an issue for his opponent, no matter if it's Ryoma or someone else. As for the rest, we don't actually know these things. They're just assumptions.Atleast we Know a glimpse of Ryoga's shots. Also, he is a copy of Nanjiroh, and we have also an idea on the playing style of Nanjiroh(Zone,Closed eyes,Nitoryu)
Speaking of assumptions, there's another very significant one that we've all been making so far: that the match format in the finals will be the same as in the semis. But, considering that Konomi already changed the format between the quarterfinals and semifinals, there's no real reason why he couldn't do it again. Going back to the D2 -> D1 -> S3 -> S2 -> S1 format would be weird of course, but what if the finals are going to be the same as the G10 matches?
If the finals followed the same format as the G10 matches, suddenly we'd have 13 slots left over rather than 10. This means there would easily be enough space for all 9 remaining middle schoolers plus 4 high schoolers. While I wouldn't consider this scenario probable, it's at least possible and maybe interesting to play around with.
Vs Germany
D1: Irie/Kirihara
S1: Byoudouin
Vs Spain
D3: Kite/Marui
S4: Fuji
D2: Tanegshima/Sengoku
S3: Kintarou
D1: Atobe/Oshitari
S2: Tokugawa
S1: Ryoma
D1: Irie/Kirihara
S1: Byoudouin
Vs Spain
D3: Kite/Marui
S4: Fuji
D2: Tanegshima/Sengoku
S3: Kintarou
D1: Atobe/Oshitari
S2: Tokugawa
S1: Ryoma