Landorus-T isn't a Zard Y counter, it can't come in directly into it otherwise it will probably be KO'd by a fire blast, or leave it at really low healthI haven't extensively tried out this team that much, but I did run into a sun team with Charizard-Y and it basically wrecked this team. The major problem was that none of the Pokemon was fast enough (Ludi can't Swift Swim under sun, and Toed can't handle Solar Beams well). There were also other matches in which Toxicroak can't even get a good setup simply because there were way too many Pokemon that could outspeed and kill it.
Thus, I suggest that Scarf Landorus-T be put somewhere on the team; it can take care of Charizard-Y, revenge-kill with its great speed, and provide a good switch-in to many electric-types that could pose a threat. This is just my opinion so far, so I'll try to test this team out more.
You do not want to let Landorus take SE damage anyway. We also have a ton of switches for water types. It has good synergy with the team and should be tested, it can't be worse than Toxicroak at least.I realize Landorous is good, but isn't kind of a bad idea to put something water weak into a team made to boost water type moves?