3-SYLLABLE WORD RHYTHMS Words Ending in -TION, -SION, -CIAN Sharing one of the graphics that will be in Part 2 of English Pronunciation Guide for Japanese Speakers, in the Chapter about Word Rhythms.
Source: (1) American English Pronunciation Coach
If you use schwa in the final syllable, your Japanese students will probably give it too much vowel-sound duration.
Teaching English to Japanese speakers: skip schwa altogether in these final syllables Click To Tweet