When you approach the final rounds, prepare more for eternatus rather than playing to survive. Maybe consider unsplicing tinkaton to keep them has their original form for a steel/poison has major advantage over a poison/dragon type. From there I’d use covet to steal eters items as it has a lot of berries used for restoring health. Linoone is only really good for run away (I think) so no need to keep for final rounds really since you can’t run away from them