I wouldn't say it far exceeds Roselia outside of HO because Grass-type is also pretty nice actually, but Trubbish is definitely a decent Pokemon, and it's not outclassed by Roselia because it differentiates itself with its different typing allowing it to take on Jumpluff an Throh better among others, better physical bulk, and Sticky Hold making its bulk actually reliable unlike with other Eviolite users.
^turns 16-22
I don't think Roselia can do that.....Also, bird spam isn't such a problem for Trubbish either...Poison being a better defensive typing than grass/poison and sticky hold making trubbish far better at tanking hits that Roselia just cant..
On a HO team, rose fits better..but Bulky Off/Semi Stall/Stall Trubbish far exceeds Roselia...Trubbish beats standard rest/ s talk/knock/storm thow Throh ..albeit it's a PP war, but a W is still a W..That or you force the switch, which is never bad when facing Throh...I don't know what the consensus is on the ban, but while Throh is here, Trubbish spikes on it and stalls it out...